sera Silicate Clear Permanent silicate removal Silicate supports the growth of diatoms in freshwater and marine aquariums. sera marin silicate clear easily and permanently binds silicate. sera marin silicate clear is delivered with a practical filter media bag. Briefly rinse with running water before use, then simply place in a filter or a place with good water circulation. Remains active up to three months, depending on the silicate level. 500 g (1.1 lb.) are sufficient for an aquarium holding 200 - 400 liters (53 - 106 US gal.). Tip: The sera SiO3-Test kit allows to reliably monitor the silicate level.