--- product_id: 89131240 title: "Penn PLAX World Aquarium Filter, Small" brand: "penn plax llc" price: "FREE" currency: EUR in_stock: false reviews_count: 8 category: "Pet Supplies" url: https://www.desertcart.pt/products/89131240-penn-plax-world-aquarium-filter-small store_origin: PT region: Portugal --- # Penn PLAX World Aquarium Filter, Small **Brand:** penn plax llc **Price:** FREE **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Penn PLAX World Aquarium Filter, Small by penn plax llc - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/89131240-penn-plax-world-aquarium-filter-small) ## Best For - penn plax llc enthusiasts ## Why This Product - Trusted penn plax llc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Size:3.UNITS Small World Aquarium Filters are specifically designed for small aquariums of all shapes and sizes up to 5 gallons. Quick and easy to install, Small World Aquarium Filters keep your water crystal clear while eliminating contaminants and maintaining a healthy environment for your fish. This filter includes a bracket measuring 4-1/2"x 1-1/2"x 1" and fits in almost any small aquarium with an easy to replace disposable cartridge filter. The high quality disposable cartridge consists of carbon and zeolite for chemical filtration combined with a bio foam sponge. The zeolite crystals eliminate ammonia while the top quality activated carbon removes harmful gases and odors. The bio foam helps promote biological filtration leaving you with crystal clear water. These filters attach easily to any air pump (not included) using your existing tubing and will help keep your small aquarium healthy and looking beautiful. ## Features - Helps keep your small aquarium healthy and looking beautiful - Specifically designed for small aquariums up to 5 gallons - Fits almost any small aquarium shape or size and is compatible with any air pump - Helps keep your small aquarium healthy and looking beautiful ## Images ![Penn PLAX World Aquarium Filter, Small - Image 1](https://images-na.ssl-images-amazon.com/images/I/51ZzASKD0UL.jpg) ![Penn PLAX World Aquarium Filter, Small - Image 2](https://images-na.ssl-images-amazon.com/images/I/31wr2OJf7fL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect for a very small tank *by R***N on February 26, 2016* I used these several years ago for small fish tanks. Then it got to where I could no longer find them at Walmart or other stores. So I was glad to find them at amazon. The cylinder shaped round tank in the photo I attached is only about 8 inches across. And the under-gravel filtration that was included with the tank didn't have filter fiber or carbon. So the Penn Plax filter was just the right size for the extra filtration I needed. And the replacement cartridges were a very reasonable price in a 6-pack. ### ⭐⭐⭐⭐ Great for bettas...with a few upgrades *by N***E on August 7, 2016* This is a great betta filter, with a few modifications. This filter is small and unobtrusive. It fits my 1.5 gallon quarantine tank and 3 gallon tanks well. I popped off the backs of each filter cartridge and inserted ceramic media on top and the sponge stays on the bottom. After cycling, the sponge and ceramics get rinsed every few weeks in the old just removed tank water (never tap water) so the beneficial bacteria doesn't die. I can slip in a piece of carbon pad with a section of the lower sponge and just replace the carbon every other week. Never need to replace the plastic cartridge. I just place the back on again and secure with a rubber band before popping it back into the holder! My betta are not bothered by the gentle bubbling and even like to rest on top of it. The bubbles give adequate suface disturbance for 3 gallon or under tanks. I am very pleased. I now have basic 3 stage filtering for my bettas. ### ⭐⭐⭐⭐⭐ Perfect for 1-3 Gal tanks *by D***E on January 18, 2017* Perfect for 1-3 Gal tanks.I have 2, one in a 1.5 and the other in a 2.5. Both work great and have had no issues.I would not recommend to use this in anything bigger than a 3 gallon tank, you'd need more suction and flow force to circulate the water and evenly filter all the water. This is for a single fish (betta) or smaller schools of fish such as a few neon tetras, grow out tank, platy's etc etc. I'm sure we all knew that already but some reviews are saying it's weak or that it doesn't do it's job but are using it in 5+ gallon tanks lol.If you want a small filter to use in a 1-3 gallon tank, look no further. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/89131240-penn-plax-world-aquarium-filter-small](https://www.desertcart.pt/products/89131240-penn-plax-world-aquarium-filter-small) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-04-25*