Review on 🐟 AQUANEAT Aquarium Moving Bed Filter Media 1 Gallon - Efficient Filtration for Fish Tanks, Sumps, Koi Ponds and More by Kimberly Thomas

I'm sure this material will do well for the right application. For my application I used it to create a 5 gallon biofilter on a gravity fed downcomer. This carrier is so small and light that it got caught in the pipes when cleaning. Also, the clumps around the pipe holes clog them up and they float, giving me a layer of useless medium over those in the water. I'm sure they work fine when set up correctly, but if you have the same setup as mine, they were too much of a hassle. I removed them and replaced them with 1 inch bio balls and they worked much better for me.