MICROBE-LIFT BSEP16 Concentrated Barley Straw Extract Plus Liquid Peat Conditioner for Ponds and Outdoor Water Garden, Safe for Live Koi Fish, Plants, and Decorations, 16 Ounces. RICH IN ORGANIC PEAT: Liquid peat softens pond water by reducing nitrate and phosphate concentrations in the water column; It also provides a buffering agent and ion attenuation in lined ponds that replicates the benefits of earthen ponds.
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