For low prices on Eheim canister filter sets, look no further. Each convenient pack includes a coarse blue filter layer and two fine white filter layers.
A multi-filter system like canister filter models from Eheim is effective and efficient. The coarse blue layer filters large particles, while the double-layer fine white filters sift out smaller particles. The system works to control toxic waste build-up in your aquarium as well as other unsavory additives that may be in untreated tap water.