Concentrated liquid form of Barley Straw. Works immediately - ideal for patio container ponds.
Safe for pets, wildlife and children as it is an organic method of pond algae control
Extract of Barleystraw is supplied in a 250ml bottle which treats up to 4500 litre (1000 gallons) or will give 25x10ml doses to a patio container pond (should be sufficient for one container for one year if you dose with 10ml fortnightly in Spring and Autumn and weekly in Summer when the water is warmest.)
To calculate the volume of your pond: length x width x depth in feet x 6.25 = volume in gallons.