Anti-Algae Pond Block

When placed into the pond this block slowly dissolves releasing di-methyl urea into the pond water.
Whilst totally harmless to fish and healthy pond plants this inhibits the growth of water born algae.
Prevention is always better than cure so the introduction of this item in early Spring will prevent build up of algae as the weather warms.
Initially use one block per 400 litres if the water is very dirty.
One block per 1000 litres of water.