1700mlThe bottom of the pond is polluted by leaves, aquatic plant debris and fish excrement, which prevents the growth of aquatic plants, butincreases algae. Vincia Sludge Cleaner cleans the pond bottom and naturally prevents new sludge formation. Acidification of the soil surface is prevented by the pH-lowering grains, the natural lime ensures the correct water hardness and micro-organisms start the bacterial conversion of the soil dirt.TipRemove leaves and dead plants. Give the fish good quality food, the less waste in the pond, the less chance of algae in the spring.With the Vincia 100% natural pond products, Velda focuses on keeping the pond, fish and plants naturally clear, healthy and beautiful. They are 100% environmentally friendly and biodegradable. Vincia is for the pond lover who would rather not use unnatural means, but would like to enjoy clear water.Also available in 4250ml (1330685)