Ehfimech is used in filters to remove suspended particles. Its physical action creates water turbulence within the filter itself, causing the particles to sink and settle.Coarse dirt particles are also removed from the water flow. Where do I place Ehfimech in my filter? It is placed as a first layer in the filter. How do I clean Ehfimech? Ehfimech can be washed under lukewarm water and can be used several times. Re-usable and cost effective During regular maintenance we recommend that Ehfimech is cleaned with tank water to prevent bacteria being killed by chlorine in tap water