Algae Starver (Pond Strength) 500ml

Aqua Pica Algae Starver in Pond Strength is a  fish safe  liquid phosphate remover, contributing to reducing the phosphates to such a low level that it starves the algae within a pond.
Add 5ml to 500 litres of water every 2 to 3 days until phosphates are under control. Then add the maintenance dose every 2 weeks. 1 litre treats up to 100,000 litres of water.