AQUANEAT Aquarium Bio Sponge Sheet Filter Media Pad Open Cell Foam Cut-to-fit Matten Filter Fish Tank Sump Divider 23.6" (Fine);

FEATURE: Offers more surface area for the beneficial nitrifying bacteria to colonize Eliminate toxic compounds and improve water quality Provides better water flow rate and less chance of clog Can be trimmed to any size with a utility knife SPECIFICATIONS: Size: 17.7" x 17.7" x 2"/23.6" x 17.7" x 2" Color: black Includes: 1 piece of Filter Pad The open cell sponge specifically manufactured for aquarium and pond use has a much larger inner surface area for beneficial biological capacity than the cheap close cell sponge in the market. The reticulated structure also provides better flow rate of water and less chance of clog. You can use it in any aquarium or pond filter, sump, wet/dry, canister, power filter etc. or your HMF DIY project. It can be trimmed to any size with a utility knife. The size of pores is measure in pores per inch (PPI). The sponge with higher PPI has more pores in it. More pores means larger biological filtration capacity but with less water flow through rate and needs to be cleaned more often. It is recommended to use combination of sponge with difference PPI to get the best result.