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Penn-Plax Small World Aquarium Filter – Comes with a Disposable Media Cartridge (Bio Sponge, Carbon, and Zeolite Crystals) – Safe for Freshwater and Saltwater Setups (SWF1)

4.2 4.2 out of 5 stars 2,556 ratings
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Amazon's Choice in Aquarium Filters by Penn-Plax

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Aquarium Filter

Purchase options and add-ons

  • GREAT FOR SMALLER SETUPS: The Small World Filter is specifically designed for aquariums and tanks up to 5 gallons. In addition to our Small World, New World, and Betta World habitats, this filter is compatible with other tanks in the market. It fits all shapes and sizes, and also mounts securely to glass, acrylic, and plastic surfaces.
  • BIO SPONGE: In addition to the Carbon and Zeolite Crystals, the included media cartridge also contains a Bio Sponge for physical filtration of larger particulate matter, and biological filtration that optimizes the colonization of anaerobic bacteria.
  • CARBON & ZEOLITE MIXTURE: Supercharged with scientifically formulated Carbon and Zeolite Crystals, the media cartridge in this kit absorbs ammonia, nitrites, nitrates, and phosphates in a fast and timely manner, along with removing harmful chemicals and toxins, clearing up discolorations, and reducing foul odors from your aquarium, tank, or habitat.
  • CLEANING & MAINTENANCE: Before placing into your aquarium, tank, or habitat, please briefly rinse the filtration unit with warm water in order to remove Carbon or Zeolite dust. If not done before installation, the water could initially become dark or cloudy.
  • PLEASE NOTE: The Small World Filter (SWF1), does not come with Air Tubing or an Air Pump, which are Sold Separately. This Aquarium Filter comes with a Mounting Bracket w/ Suction Cups for strong and secure placement, a Disposable Media Cartridge, and a Connector that allows easy connection to standard size air tubing.

Customer ratings by feature

Easy to install
4.6 4.6
Easy to use
4.6 4.6
Value for money
3.9 3.9
Noise level
3.8 3.8

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From the manufacturer

aquarium filter fish bowl cartridge replacements
small world filter

Replacement Filter Media Cartridges are also available. Please See chart below.

penn plax
PENN-PLAX, manufacturer & distributor of top Pet Supplies

PENN-PLAX is a family owned business that was established in 1956 in Brooklyn, New York. Over the years, our goal remains the same: to enhance the pet ownership experience.

We specialize in creating excellent pet supplies for animals, both great and small. We're best known for producing pet products at affordable prices. Our brand is synonymous with innovation and quality, keeping your pet foremost in mind.

PENN-PLAX Small World Aquarium Filter for Aquariums, Tanks, Fishbowls, and Habitats

Provides Crystal Clear Filtered Water for Smaller Setups (up to 5 gallons)

PENN-PLAX presents the Small World Filter. This filter is specifically designed for aquariums and tanks up to 5 gallons. In addition to our Small World, New World, and Betta World habitats, this filter is compatible with other tanks in the market. It fits all shapes and sizes, and also mounts securely to glass, acrylic, and plastic surfaces. Furthermore, it’s safe for both Freshwater and Saltwater setups.

This filter does not come with Air Tubing or an Air Pump, which are Sold Separately.

  • The Small World Filter (SWF1), does not come with Air Tubing or an Air Pump, which are Sold Separately.
  • This Aquarium Filter comes with a Mounting Bracket, a Disposable Media Cartridge, and a Connector that allows easy connection to standard size air tubing.

Take a Closer Look at the Small World Aquarium Filter - Model Number: SWF1

filter

filter

filter cartridges

filters

Ideal for Small Habitats

Whether you’re looking to add filtration to a fishbowl, small aquarium, or a plastic habitat, the Small World Aquarium Filter provides a comprehensive filtering solution.

To be honest, no one likes doing water changes. The Small World Aquarium Filter reduces the overall time and frequency of water changes, while still ensuring a healthy and clean environment for your fish.

Easy-To-Use and Reliable

The directions are very simple:

  1. Briefly rinse the Filtration Unit with warm water in order to remove Carbon or Zeolite dust.
  2. Snap the Media Cartridge into the Filter Mounting Bracket.
  3. Connect the constructed Filtration Unit to an Air Pump.
  4. Place it in your aquarium, tank, fishbowl, or habitat, and mount it to a clean surface via the 2 Suction Cups,
  5. Lastly, plug in the Air Pump, leaving a Drip Loop, and turn it on!

3 Stage Filtration

The Small World Aquarium Filter features biological, chemical and physical filtration to actively and effectively filter your aquarium, tank, fishbowl, or habitat.

This filter uses Disposable Filter Media Cartridges that contain, Carbon, Zeolite, and a Bio Sponge.

Fits All Shapes and Sizes

Modern tanks come in globes, with rounded corners, or smaller sized panels. As the creatively continues with these designs, mounting an aquarium filter becomes an issue.

But with the narrow profile of the Small World Filter, even the smallest of areas is no issue for this little filtration unit!

filter

Keep Reading for Additional Details

Carbon & Zeolite Mixture:

  • Supercharged with scientifically formulated Carbon and Zeolite Crystals, the media cartridge absorbs ammonia, nitrites, nitrates, and phosphates in a fast and timely manner, along with removing harmful chemicals and toxins, clearing up discolorations, and reducing foul odors from your aquarium, tank, or habitat.

Bio Sponge:

  • In addition to the Carbon and Zeolite Crystals, the included media cartridge also contains a Bio Sponge for physical filtration of larger particulate matter, and biological filtration that optimizes the colonization of anaerobic bacteria.

Please Note:

  • The Small World Filter (SWF1), does not come with Air Tubing or an Air Pump, which are Sold Separately. This Aquarium Filter comes with a Mounting Bracket w/ Suction Cups for strong and secure placement, a Disposable Media Cartridge, and a Connector that allows easy connection to standard size air tubing.

Measurements:

  • Mounting Bracket (1.5” x 1.25” x 5”)
  • Media Cartridge (1.3” x 1.1” x 4.1”)

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Customer Reviews
4.2 out of 5 stars
2,556
4.2 out of 5 stars
2,556
4.1 out of 5 stars
429
4.1 out of 5 stars
429
4.2 out of 5 stars
2,556
Model Number SWF1 SWF1C SWF2 SWF2C SWK1UL
Item Type Small World Filter Small World Replacement Filter Media Cartridges Small World Fishbowl Under-Gravel Filter Kit Small World Replacement Fishbowl Under-Gravel Filter Media Cartridges Small World Aquarium Air Pump and Filter Kit
Item Description The Small World Filter is specifically designed for aquariums, tanks, and habitats up to 5 gallons. This filter does not come with Air Tubing or an Air Pump, which are Sold Separately. These Replacement Media Cartridges are specifically designed for Small Word Filters (Model SWF1), allowing for simple and easy media replenishment, and are for aquariums, tanks, and habitats up to 5 gallons. Cartridges come in a 2 pack. The Small World Fishbowl Under-Gravel Filter Kit is specifically designed for all drum or round bowls with a 4” or larger opening, providing a health and clean environment for your fish. Ideal for fishbowls and cylindrical aquariums. These Replacement Media Cartridges are specifically designed for Small Word Fishbowl Filters (Model SWF2), allowing for simple and easy media replenishment. Cartridges come in a 2 pack. The Small World Air Pump and Filter Kit is specifically designed for aquariums and tanks up to 5 gallons. This Kit comes with an Air Pump, Air Tubing, a Control Valve, a Filter Mount with Connector, and a Filter Media Cartridge.

Product guides and documents

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 6 x 2 x 6 inches; 2.88 ounces
  • Item model number ‏ : ‎ SWF1
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ August 3, 2004
  • Manufacturer ‏ : ‎ Penn Plax
  • ASIN ‏ : ‎ B0002565KC
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.2 4.2 out of 5 stars 2,556 ratings

Looking for specific info?

Product Description

PENN-PLAX presents the Small World Filter. This filter is specifically designed for aquariums and tanks up to 5 gallons. In addition to our Small World, New World, and Betta World habitats, this filter is compatible with other tanks in the market. It fits all shapes and sizes, and also mounts securely to glass, acrylic, and plastic surfaces. Furthermore, it’s safe for both Freshwater and Saltwater setups. Carbon & Zeolite Mixture: Supercharged with scientifically formulated Carbon and Zeolite Crystals, the media cartridge in this kit absorbs ammonia, nitrites, nitrates, and phosphates in a fast and timely manner, along with removing harmful chemicals and toxins, clearing up discolorations, and reducing foul odors from your aquarium, tank, or habitat. Bio Sponge: In addition to the Carbon and Zeolite Crystals, the included media cartridge also contains a Bio Sponge for physical filtration of larger particulate matter, and biological filtration that optimizes the colonization of anaerobic bacteria. Cleaning & Maintenance: Before placing into your aquarium, tank, or habitat, please briefly rinse the filtration unit with warm water in order to remove Carbon or Zeolite dust. If not done before installation, the water could initially become dark or cloudy. For best results, the disposable media cartridge should be replaced every 2 – 4 weeks, ensuring a crystal clear and healthy environment for your fish. Please Note: The Small World Filter (SWF1), does not come with Air Tubing or an Air Pump, which are Sold Separately. This Aquarium Filter comes with a Mounting Bracket w/ Suction Cups for strong and secure placement, a Disposable Media Cartridge, and a Connector that allows easy connection to standard size air tubing. Measurements: Filter Mounting Bracket with Connector (1.5” x 1.25” x 5”), and Filter Media Cartridge (1.3” x 1.1” x 4.1”).

Important information

Directions

Before placing into your aquarium, tank, or habitat, please briefly rinse the filtration unit with warm water in order to remove Carbon or Zeolite dust.

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Penn-Plax Small World Aquarium Filter – Comes with a Disposable Media Cartridge (Bio Sponge, Carbon, and Zeolite Crystals) – Safe for Freshwater and Saltwater Setups (SWF1)
Penn-Plax Small World Aquarium Filter – Comes with a Disposable Media Cartridge (Bio Sponge, Carbon, and Zeolite Crystals) – Safe for Freshwater and Saltwater Setups (SWF1)
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Price$10.44$9.89$12.99$9.99-29% $9.99
List:$13.99
$9.99
Delivery
Get it as soon as Wednesday, Apr 3
Get it as soon as Tuesday, Apr 2
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Customer Ratings
Noise level
3.8
3.9
3.8
3.0
4.6
4.1
Suction power
3.7
4.2
3.3
3.4
4.6
4.0
Value for money
3.9
3.5
2.8
3.0
4.3
Easy to clean
4.2
3.6
4.1
4.7
4.2
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Customer reviews

4.2 out of 5 stars
4.2 out of 5
2,556 global ratings

Customers say

Customers like the size and effectiveness of the filter. For example, they mention it's great for small fish tanks and doesn't take up much space. Customers also like the value, ease of use, and quality. That said, opinions are mixed on noise, cleanliness, and clarity.

AI-generated from the text of customer reviews

163 customers mention115 positive48 negative

Customers like the quality of the water filter. They say it works well, is silent, and is perfect for regulating bubble volume. Customers are also satisfied with its durability and ease of use.

"...This filter works amazing. I can slow it down to barely a bubble just enough and my bettas are so happy!..." Read more

"I’ve used these before and am very satisfied with their durability and ease of use." Read more

"...The pump worked good for six weeks and then it died. I guess you get what you pay for..." Read more

"...This little air driven filter was the perfect solution. It works well and was very easy to install. The one downside is the media is not removable...." Read more

115 customers mention92 positive23 negative

Customers like the filter. They say it's an effective filter, perfect for a beta tank, and suited for nitro aquariums. The filters work great in trapping debris and filtering the water. Some mention that it'll work fine for their needs.

"...I think this is a great filter for my tank which is 1.6 gallons and didn't come with a filter. Very small doesn't take up to much room in his tank...." Read more

"...These filters are amazing! The kit comes with everything you would need and installs easily...." Read more

"...Regardless, great little filter!" Read more

"This is a really nice filter suited for a nano aquarium. The only downside is that the cartridge is disposable and isn't designed to be opened...." Read more

76 customers mention63 positive13 negative

Customers like the size of the filter. They say it's perfect for small fish tanks and doesn't take up much space. Some say it is easy to assemble and fits nicely in a fish bowl. Overall, most are satisfied with the size and functionality of the product.

"...My bowl is ~3 gallons and it doesn't take up much space, still plenty of room for plants and decor...." Read more

"...They work great in a five gallon tank but I can't get past all the plastic waste." Read more

"...Probably great for beginner fish keepers who are not in tune to the nitrogen cycle, though...." Read more

"This filter is the perfect size for my 2-gallon fish tank...." Read more

65 customers mention46 positive19 negative

Customers like the value of the water filter. They say it's inexpensive, the best little filter money can buy, and the replacement filters and cartridges are affordable. Customers also say it auctions to the side.

"...to go with it as I have the pump lower than the tank, but they are super cheap and easy to find online...." Read more

"What a great little filter for the price!My daughters got little 2 gallon tanks made by Top Fin...." Read more

"...Edit: filter media is super cheaper. It's already worn out, bubbles come out slowly. I've added more pictures here...." Read more

"...with easy modification it becomes the most efficient and affordable small tank filter money can buy!" Read more

49 customers mention49 positive0 negative

Customers find the potable water filter easy to setup, maintain, and use. They mention that it's simple, inexpensive, and effective. Customers also appreciate the compact size and the ability to swap out filters easily.

"...The set up was super quick and easy...." Read more

"...The kit comes with everything you would need and installs easily...." Read more

"...used these before and am very satisfied with their durability and ease of use." Read more

"...It is simple to set up, the filter works great for keeping the tank clean, it sticks to the side of the tank easily, and makes little noise...." Read more

78 customers mention33 positive45 negative

Customers are mixed about the noise of the water filter. Some mention that it's super quiet, while others say that it makes a loud popping noise. Some customers also mention that the bubbles are noisy. Overall, opinions are mixed and depend on the individual user.

"...Don't see how water even goes into the filter and it is all around very very noisy which is annoying since the tank has to be in our bedroom...." Read more

"...The pump is small and super quiet, I have it in my bedroom and have no trouble sleeping with it running, the ceiling fan acctually makes more noise...." Read more

"...I'd give it five stars but the air pump is a little loud, but that's also expected for the low price." Read more

"...the tank clean, it sticks to the side of the tank easily, and makes little noise...." Read more

66 customers mention34 positive32 negative

Customers are mixed about the cleanliness of the filter. Some mention it does a wonderful job of keeping the tank clean, is easy to clean, and works well in a small tank. However, others say that it gets dirty kinda fast, can't be cleaned, and can're not effective at cleaning or aerating the water.

"...It is simple to set up, the filter works great for keeping the tank clean, it sticks to the side of the tank easily, and makes little noise...." Read more

"...The tank was filthy within a couple of days and I had brown algae and cloudy water...." Read more

"The filter keeps my tank clean and does a good job. However the air pump is a little louder than expected, especially if the tank is in your room...." Read more

"...day of running it the tank is just as cloudy and our poor fish is still swimming in filth and hopefully won't die before a different filter we..." Read more

65 customers mention39 positive26 negative

Customers are mixed about the clarity of the water filter. Some mention that it keeps the tank crystal clear, while others say that it works well and keeps the water clear. Some say that the water is a little cloudy when they first put it in, while other say that in five days the bowl goes back to looking cloudy.

"...And with in a half hour of running I could tell the water clarity was getting better...." Read more

"...When I first hooked it up, the flow was crazy fast and I was so sad.. didn't even set up the second one because I was ready to return...." Read more

"...With this do-it-yourself refill setup water stays crystal clear and it will catch large and small particles with ease...." Read more

"...we have this filter, the fish have been very healthy and the water much clearer...." Read more

Fit in my 1.6 gallon
5 Stars
Fit in my 1.6 gallon
So I read a lot of reviews people complaining about noise, which if u buy the kit with the air pump it is super quiet. Then people complained about not being able to take the thing apart to clean. I mean for $7 a month I can replace the cartridge. The power is controllable which is nice as it doesn't suck my betta fish in like most filters do. People complained about it making there tank cloudy but I rinsed it really well and ran it for 15 minutes in just a bowl of water to get any excess gunk out and it worked just fine. Didn't make my water cloudy at all. And with in a half hour of running I could tell the water clarity was getting better. I think this is a great filter for my tank which is 1.6 gallons and didn't come with a filter. Very small doesn't take up to much room in his tank. Also filter replacement is very easy. You just pop it out and stick a new one in.
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Top reviews from the United States

Reviewed in the United States on January 24, 2024
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
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5.0 out of 5 stars I regretted it, then I loved it!!
Reviewed in the United States on January 24, 2024
I did alot of research for slow flow betta filters and seen this one highly recommended and for the cost I ordered two sets for both my bettas. When I first hooked it up, the flow was crazy fast and I was so sad.. didn't even set up the second one because I was ready to return. I didn't see the part that you can add to the tubing to adjust the flow. Once I found that part when I set up the second one, I was AMAZED. Bettas don't like fast flows, almost no movement is their preference because more can stress and tear them up. This filter works amazing. I can slow it down to barely a bubble just enough and my bettas are so happy! I would definitely recommend these over any expensive pet store filter!!
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Reviewed in the United States on March 7, 2024
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
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5.0 out of 5 stars Fit in my 1.6 gallon
Reviewed in the United States on March 7, 2024
So I read a lot of reviews people complaining about noise, which if u buy the kit with the air pump it is super quiet. Then people complained about not being able to take the thing apart to clean. I mean for $7 a month I can replace the cartridge. The power is controllable which is nice as it doesn't suck my betta fish in like most filters do. People complained about it making there tank cloudy but I rinsed it really well and ran it for 15 minutes in just a bowl of water to get any excess gunk out and it worked just fine. Didn't make my water cloudy at all. And with in a half hour of running I could tell the water clarity was getting better. I think this is a great filter for my tank which is 1.6 gallons and didn't come with a filter. Very small doesn't take up to much room in his tank. Also filter replacement is very easy. You just pop it out and stick a new one in.
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Reviewed in the United States on March 11, 2024
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
Reviewed in the United States on May 22, 2021
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
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T C
5.0 out of 5 stars Penn-plax filter kit
Reviewed in the United States on May 22, 2021
I ordered the full kit that comes with the air pump. It comes with a valve so you can adjust the flow, I think it will work great when I get my new betta since they don't like alot of water movement. The pump is small and super quiet, I have it in my bedroom and have no trouble sleeping with it running, the ceiling fan acctually makes more noise. The set up was super quick and easy. I did have to order a check valve to go with it as I have the pump lower than the tank, but they are super cheap and easy to find online. The only thing I would change would be to make the filter cartridges open so you can change out the media, but other reviews have said they are easy to modify so it shouldn't be an issue. My bowl is ~3 gallons and it doesn't take up much space, still plenty of room for plants and decor. My water is a little cloudy right now but it is still cycling.
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Reviewed in the United States on August 30, 2016
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
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Reviewed in the United States on February 28, 2024
Pattern Name: Aquarium FilterVerified Purchase
Reviewed in the United States on November 7, 2023
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
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1.0 out of 5 stars A worthless annoying noise machine
Reviewed in the United States on November 7, 2023
After a full day of running it the tank is just as cloudy and our poor fish is still swimming in filth and hopefully won't die before a different filter we ordered will arive. Don't see how water even goes into the filter and it is all around very very noisy which is annoying since the tank has to be in our bedroom. Save your money. Don't buy this noise machine if the lack of cleaning doesn't kill your fish you might annoy it to death with the amount of noise this thing makes.
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Reviewed in the United States on November 26, 2023
Pattern Name: Replacement Media CartridgesVerified Purchase

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JB
5.0 out of 5 stars Great for smaller tanks
Reviewed in Canada on January 14, 2024
Pattern Name: Aquarium FilterVerified Purchase
GUILLERMO AVILES
5.0 out of 5 stars Muy bueno lo recomiendo
Reviewed in Mexico on June 10, 2022
Pattern Name: Replacement Media CartridgesVerified Purchase
ASuxo
3.0 out of 5 stars Funcionalmente útil
Reviewed in Mexico on December 26, 2021
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase
Mr. Stephen Conlon
5.0 out of 5 stars Quality
Reviewed in the United Kingdom on October 24, 2023
Pattern Name: Aquarium FilterVerified Purchase
Brandon
5.0 out of 5 stars Nice kit for small tanks
Reviewed in Canada on July 10, 2020
Pattern Name: Aquarium Air Pump and Filter KitVerified Purchase