I'm just starting to play with them. Currently filtering a 10 and a 20 with one sponge in each. The finer pores are good at clearing/polishing the water but I think I'll be using the larger pores since I do a weekly water change of about 75% in my breeding tanks anyway and that removes most particulate matter right then. The larger pores are just fine for bio and don't clog as soon, and since I help with constant vacuuming it seems to be working out just fine. Seeded them so haven't seen any ammonia but I don't know why I even would.
Is it safe to assume that an air pump powering four sponges is cheaper on power than four separately running motor-driven filters?
