Do you have persistent problems with blanketweed or duckweed in your pond? Phosphate (a form of phosphorus) found in fish food and tap water may be the problem.
Phosphorus is an essential element for life. Usually it is bound with oxygen and other minerals to form phosphates. It is also found in animal bones (calcium phosphate).
High levels of phosphate in ponds are a major cause of green water and blanketweed problems, and can also cause nuisance levels of duckweed. Continue reading