doesn't look much different then a pot scrubbie... same w/ the K1.. I was looking into better bio-medias ( hate chemical filtration myself and my focus on bio and mechanical.) But 1$ for 1$ I'm more then happy with what the cheapo pot scrubbies can handle. I have one tower and about 200 scrubbies for my 1k pool thinking i'de need another tower but all I need is more circulation because the one small tower keeps my water perameters just fine.. i'm not 100% happy with my flow in the pool. so I need another pump not to do better filtration but more water circulation itself. and I prefer trickle wet/dry filters to the reactors ime bio-media gets limited by O2 before anything else. may as well make use of the air vs waters o2 levels. but I do have a smaller area in the bottom for 100% submersion in case the power goes out ect I have a remaining colony to keep going/instant re-seed with. ends up iir about 80%trickle/20%submersed..