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The Leader Aqua Trough Block is designed to control the build-up of algae and slime in stock water troughs to ensure clean drinking water for livestock over a period of time. One trough block treats approx. 6750 litres of water. Place one block for 30 sheep or 15 cattle in a non-metallic or painted water trough. Replace block when slime starts to return. Usually lasts 5 - 8 weeks. Cobalt is added as a nutritional supplement for cattle and sheep, where diet levels may be low. DO NOT use in areas where copper toxicity is known to occur, or in bare metal troughs. Active Constituent: 63g/kg Copper(Cu) Present as 250b/kg Copper Sulphate Pentahydrate. *CAUTION: If stock are suspected of having Lupinosis, remove blocks from troughs immediately.