Small World® Filter Units & Replacement Cartridges for Small Tanks

I first discovered these a few years ago when I got a 19-cent goldfish at the pet store. I was determined to give him/her a long life, but I didn't want to invest in a whole big aquarium layout. I knew that an unfiltered bowl was a recipe for disaster so I tried this.

It's a terrific system. The little filter attaches to an inexpensive pump you buy separately. Suction cups hold the filter in place inside a bowl of your choosing. The filter is pretty small so I wouldn't recommend a tank that's much larger than 2 or 3 gallons. I am also not sure this device would work on a spherical bowl -I THINK you need something with at least one flat side.

The filters are inexpensive and super super easy to swap out after a couple weeks' use.

This little feeder goldfish was one of my favorite pet experiences and I attribute his long life (four years!!!) to his healthy bowl.

I uploaded a video so you can see the size and hear the pump.

When we first won two goldfish for our two boys at a fair, we bought the bowl and rocks, but no filter. A week later, one of the fish died, even though I have been changing the water with filtered water.

Now that we have this filter, the fish have been very healthy and the water much clearer.

I still change the water out each weekend, and wash the rocks and inside of the bowl because it gets pretty slimy. So far the fish seem to be really happy.

The main con is the pump is a little noisy, hence four stars.

Below is the review of the replacement filter.

When I ordered a Filter replacement, I got the wrong product:

I needed the SWF-1C rectangular cartridge but I ordered from ToysNGames and received the SWF2C cylindrical instead.

I highly recommend this for a small 2 gallon fishbowl to help keep the water clear instead of having your fish swim in stagnant water.

Each time I switch out the water, I have to rinse the filter case as well since there is a layer of slime? The white filter part turned tan after about 3 weeks.

I change the water with carbon filtered water every week and add some water treatment.

So far, my comet goldfish has been pretty happy.

Again, the correct replacement filter needed is the SWF-1C

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I have a hexagonal three-gallon tank that is home to my grandson's carnival-won goldfish year after year. I don't have the heart to flush these fish away, probably because I don't have to regularly clean or replace the water.

The unit attaches to the inside glass with two suction cups and always stays in place. The filter is excellent for providing the necessary aeration and filtration to keep these fish lively and disease-free, and one cartridge keeps the tank crystal clear for three months. [If you have a smaller tank or bowl with fewer fish, the cartridge will last longer.]

Two of our "carnival fish" are four years old and still lively.

I'm hoping my grandson will stop winning these fish so I can purchase the fish I actually want.

With no moving parts, the filter lasts forever and is powered by a small air pump outside the tank and connected to the filter with flexible tubing. The cartridges are easy to replace by just snapping them into the unit.

Read Best Reviews of Small World® Filter Units & Replacement Cartridges for Small Tanks Here

Handy little filter for my fishbowl. Keeps the bowl real clear even with a live plant inside. I have it clipped onto the top of my bowl with my own clip because it's designed for a flat walled aquarium. Also the pump is a navy blue, not teal as in the picture, which I like better.

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I tried to order this items twice and was sent Smallworld Carbon/Floss Filter Cartridges instead. I finally gave up and purchased the product at Petco.

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