6-Pack, Size B, Rite-Size Cartridge Refills

Good filters

These fit perfectly and the price is great

These filter well, but I wish they were more environmentally friendly. They would be more efficient if I could clean them for reuse. They leave black specks on the fabric which sometimes get into the tank. They do a good job cleaning the tank.

It sit and works perfectly

works in aqua-tech filters also

Buy these through Amazon because of value. Only issue is when receiving a lot of charcoal dust in package.

Satisfied. Used many years

They work fine! Best to get when on for a good price!

Awesome Find

Works well