Blagdon 250ml Clear Pond Pond TreatmentClear pond rapidly clears green, cloudy, dirty or milky water by clumping together suspended particles causing them to sink or become trapped in the filter. Clear Pond's formula is naturally safe and enhances mechanical filtration in your pond. Key Features: Enhances mechanical filtration. Naturally safe Use when: Pond water is cloudy dirty and brown grey in appearance. Harmless to filters and all species of pond fish, plants and water using wildlife.