Filter Wool 3.5oz 100g Mechanical Filter Media

sera filter wool for the mechanical prefiltration 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. For fresh and marine water filtration.
Tip: When used in combination with sera phosvec•clear and sera pond crystal, sera filter wool makes it easier to remove the bound substances.