NTLabs 1L AquaclearNT Labs Aquaclear Pond Dye 1L is an effective pond treatment designed to help control green algae and blanket weed while keeping fish, plants and wildlife safe. It works by tinting the water a subtle blue, reducing sunlight penetration that algae need to grow. Key Features Helps control green algae and blanket weed Safe for all pond fish, plants and wildlife Creates a subtle blue tint in pond water Leaves pond plants unharmed Ideal for ongoing algae