For mechanical pre-filtration of fine dirt particles. Sera Filter Wool for mechanical pre-filtration consists of stable fibers that retain finer dirt particles for a longer time without sticking or collapsing. Sera Filter Wool can be washed out several times and re-used. Suitable for all filters. We recommended Sera Siporax Professional for biological filtration. Sera Siporax Professional is open pored and three dimensional for lasting pollutant breakdown. Sera Filter Wool must be rinsed under warm water before using it for the first time. Sera Filter Wool is an economical filter medium for fresh and salt water aquariums. Sera Filter Wool is suitable for internal and external filters and can be washed out several times. It is very stable and retains particles for a long period without clogging. Tip: When used in combination with Sera Phosvec and Sera Pond Crystal, Sera Filter Wool makes it easier to remove the bound substances. 100 Grams (3.5 oz.)
