This should be a staple of everyone's filter media.  It is really cheap and seems to last forever. I still have some of original stuff I bought over a year and a half ago. One pack is enough to fill two HOB filters. There seems to be plenty of room for bacteria to grow and it is really good at catching debris from going back into the tank. Cleaning is a breeze. Just squeeze it in a bucket of old tank water. I would suggest rinsing every time you do a water change, but every other time would be fine. Just make sure you DON'T wash it in tap water because you will kill all your good bacteria! I'll definitely be buying this again when it actually needs replaced.
This should be a staple of everyone's filter media. It is really cheap and seems to last forever. I still have some of original stuff I bought over a year and a half ago. One pack is enough to fill two HOB filters. There seems to be plenty of room for bacteria to grow and it is really good at catching debris from going back into the tank. Cleaning is a breeze. Just squeeze it in a bucket of old tank water. I would suggest rinsing every time you do a water change, but every other time would be fine. Just make sure you DON'T wash it in tap water because you will kill all your good bacteria! I'll definitely be buying this again when it actually needs replaced.