Green Water, also known as Pea Soup or pond algae, can spoil the appearance of a pond and can create a biological imbalance that could result in an... TAP No More Greenwater 1Kg Treats 11250 Litres - Green Pond Water Treatment. One tub treats 2,500 gallons (11,250 litres). No More Greenwater is an infusion of natural minerals and additives which when added.