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sera Filterwatte 500g For mechanical primary filtration of small dirt particles sera filter wool for mechanical primary mechanical filtration consists of strong fibers that prevent small dirt particles from settling and sticking together. sera filter cotton can be rinsed many times. Suitable for all types of filters. We recommend sera siporax Professional for thorough biological water treatment. sera siporax Professional has a porous, three-dimensional structure - ideal for continuous breakdown of pollutants. Sera filter cartridges must be washed under running warm water for the first time before being placed in the filter. Note: together with sera phosvec･clear and sera pond crystals, sera filter wool facilitates the removal of bound material.
