Siliphos Dupla Marin is an effective phosphate and silicate remover based on iron hydroxide for seawater aquaria. Its high binding capacity combined with its simple application make it an ideal medium for every type of filter. Excessive growth of algae due to phosphates and silicatesis reliably checked. The optimised water balance guarantees splendid corals and healthy, vigorous fish. Corals may regain their original colours after discolouring due to excess nutrients in the water. ie pigment overlay due to proliferation of zooxanthellae.The constant use of the highly effective filter material Dupla Marin Siliphos ensures that phosphate and silicate levels are kept as low as posible, optimising the chemical balance of water in aquaria. Even when the material is exhausted , no contaminations are returned to the water. 180ml for up to 720 litres seawater at 0.5 mg PO4/l. With the included net bag, Dupla Marin Siliphos can be used in any type of filter.