Pratley Clinofish® Cationic Filter Medium (For Fish Ponds/Dams) by Pratley Save Liquid error (product-badge line 32): -Infinity% $25.00 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Clinofish is a direct substitute for fish pond filter sand Scavenges toxic ammonia from fish pond water 100% natural Reduces fish mortality rates Improves water clarity Eliminates excess algae The ideal substrate for biological filters due to it's rough, porous surface Removes toxic heavy metals (such as lead) from the water It can be regenerated and used over again 25kg Clinofish website Sales Leaflet Safety Data Sheet