Como 50 Black Aquarium Fish Tank Filter Bio-Balls Filtration

These were a great design very sturdy and ideal for any filter system for a tank or pond. Highly recommended

I was going to throw away my top-fin 50 gallon filter before I saw Bio-balls used in a Make: magazine article. I tried the Bio-balls in place of the recommended filter and it works great.

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These are a bit smaller than I expected them to be, but they are still a great deal. I'd say they are about 3/4" in diameter. They came in a black mesh bag which I am using to contain them in my filter. I just put them in today. I'll update my review again after they have been in there for about a month to let you know what I think of them them. But so far, so good. And the price was a great deal! Can't complain about that at all!

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These bioballs, sold by uxcell, emit a noxious odor. It's strong enough to linger for hours even after I repacked the balls into the box it came in. If it leeches these VOCs into the air, then it will leech into the water your fish will swim in. I didn't want to risk poisoning my fish so I immediately returned it.

It's made by Xinyou Aquarium Product, item # XY-260.

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a little small but you paid for what you get. It work just fine for my 38 gal fish tank