NT Labs Barleyclear Barley Straw Extract effectively prevents the growth of green algae and blanket weed immediately after having been added to water.

For water which is already showing signs of green algae or blanket weed , add 10ml for every 634 litres (80 gallons) of water and 10ml for every 1138 litres (250 gallons) thereafter.

For best results use Barleyclear prior to the water warming in spring and continuously through the season.

Available in three sizes:

250ml treats 4550 litres (or 1000 gallons)  

500ml treats 9100 litres (or 2000 gallons)

1 litre treats 18200 litres (or 4000 gallons)