Additional chemicals, besides the sanitizers (chlorine, etc.), are generally not needed in a Fiber Clear filter. However, you can put your pool or spa on a regular program using a broad-spectrum natural enzyme designed to eliminate body oils, suntan lotions, etc. from the water. Our Fiber Blend product does exactly this. Fiber Blend provides fine filtration, combined with oil-scavenging enzyme that attacks body oils, suntan oils and cosmetic residue. This product will extend your filter cycles by removing the oils before they reach the filter while simultaneously keeping your filter cleaner.