It is also a potent fertilizer for plant and algal growth in ponds. For those serious about controlling algae it is essential to monitor nitrate levels in the pond on an ongoing basis. A nitrate test kit is available. When choosing a lily consider leave cover as well as flower. An electric unit which sits outside the pond.
Water is pumped through it and all living suspended algae cells are killed.
It eliminates green water but does not deal with blanketweed. Prices from c. 75. The unit is primarily designed to reduce limescale on UVCs and pipework but also helps reduces blanketweed. Best results are between the pH levels of 7 and 7.5. Tetra Algorem, King British Blanketweed control.