Algae blooms stem from excess Phosphates in your water - a problem the SuperFish Phos Pad eliminates at the source. By reducing dissolved Phosphate levels, it starves unsightly algae of the nutrients it requires for growth, delivering a visible improvement in algae reduction. The universal format integrates with most makes and models of filter system as the 45x25cm sheet cuts easily to match your exact filter chamber specifications. The Phos Filter Pad provides effective phosphate reduction for approximately 4 weeks until saturation occurs and the pad requires replacement to maintain optimal phosphate control. For pond and aquarium keepers seeking a straightforward, non-chemical approach to algae prevention, this Filter Pad provides reliable long-term performance. SuperFish Universal Filter Pad RangeThe SuperFish range of universal Filter Pads can be cut to any size and shape making them suitable for most brands of internal and external filters. Each of the affordably priced Pads has been designed to suit its very own specific filtration purpose.