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Seachem Flourish Phosphorus$18.49
Flourish Phosphorus? is a safe solution (4,500 mg/L phosphate) of potassium phosphate that takes the guess work out of phosphate dosing. Unlike competing products that mix nitrate and phosphate in a fixed ratio, Flourish Phosphorus? (being nitrate free) allows you to dose phosphorus according to the needs of your plants without the risk of overdosing nitrates.