New Extract of Barley Straw an Eco-friendly pond product to remove algae and blanket weedFaster acting than conventional barley strawNatural Barley Straw Extract eco-friendly solution to the problem of green water and blanket weed in ponds. Enhances pond water chemistry to prevent pond water turning green.Extract of Barley Straw contains no synthetic chemicals or artificial pesticides. It can be used in any type of pond and with any species of fish.Initial dose:125ml per 4,500 litresMaintenance:Add 20ml per 4500 litres every week to prevent algaeThis product cannot be overdosedAvailable in 250ml and 500ml bottles. This size treats 18,000L