jwh0818
Aquarium Advice Addict
You can get 100% polyfill at Walmart, Target, or any craft store. It's way cheaper to get it at these places! I"ve never had any problems with it slowing the filter. It can slow it if enough is used after the polyfill gets really dirty since the dirtier the polyfill gets the smaller the particles it can catch.
Nevermind I figured it out! How will I kmow if its safe to use? Is pure cotton the same?