NT Labs Barley Straw Double Pk

Barley Straw Pouches are natural and effective against green water algae. Harmless to pets wildlife and ponds. Barley Straw Pouches can take up to 28 days to start working and thereafter a new pouch added every 6 months will maintain effective control limiting the future growth of Algae. 2 Pouches treat 7274 litres (1600 gallons).