Green Away is harmless to filters and all species of pond fish, plants and all wildlife Green Away clumps together the suspended algae, which cause the green water problem The algae clumps then drop out of suspension or are trapped in the mechanical filtration media in your pond filter Fish will benefit from the use of this product as algae can reduce the oxygen levels in the water Treats 10,000 L (2,200 gallons); the bottle's dosing chamber makes it easy to measure the correct dose needed for your pond.
eBay