NT Labs Cristalclear Duckweed Reducer Control Treatment Garden Pond Fish Koi
(NT Labs Cristalclear 250ml (treats a 1000 gallon pond). NT Labs Cristalclear 500ml treats a 2000 gallon pond). NT Labs Cristalclear 1L (treats a 4000 gallon pond). Use with the build-up of nuisance plants such as duckweed.