OWS Lake & Pond Clarifier (10 lb. container) is a professional-grade aluminum sulfate (alum) clarifier formulated to bind excess phosphorus and remove suspended solids for cleaner, clearer water. By tying up free phosphorus—the key nutrient algae need to thrive—this clarifier helps reduce algae growth while also acting as a flocculant to settle out dirt, clay, and organic particles that cause murky or green water. It’s the same high-purity formula trusted by municipal water treatment facilities, now available for ponds and lakes.

Ideal for year-round use, OWS Lake & Pond Clarifier can be applied 1–3 times per year to maintain optimal clarity and nutrient balance. Each 10 lb. container treats up to ¼ acre foot, or approximately 0.5–1.5 lbs. of alum per 1,000 sq ft. For larger ponds or lakes, apply at 20–40 lbs. per surface acre depending on water depth, color, and turbidity levels. (For heavily clouded or nutrient-rich ponds, higher rates up to 50 lbs. per acre-foot may be used.) Always dissolve the product in water before applying evenly across the pond surface using a sprayer or broadcasting from a boat for best results.

Safe and effective for fish and aquatic life when used as directed, this aluminum sulfate pond treatment improves visibility, reduces algae formation, and restores your water’s natural beauty within days. Use it in combination with aeration or beneficial bacteria for long-term pond health and balance.