For pond water to suit both fish and plants: granules to reliably remove the algae nutrient phosphate from the pond water. Easy to use: fill the net bag with granulate, rinse under running water, insert between filter materials of the pond filter (or in special filter media chamber). Eliminates the basic nutrients of all types of algae: significant reduction of high phosphate contents (after only 24 hours), effective for about 3 months. Without any harmful side effects: not dangerous for fish, no release of aluminium, suitable for all standard pond filters with filter media containers.