PlantGuy's GH booster 1lb
Gh Booster is a 1:3:3 mixture of Magnesium Sulfate ( MgSO4), Potassium Sulfate ( K2so4) and Calcium Sulfate (CaSO4) essential for protein synthesis, root and lignin development and nutrient transport. Raises General Hardness (GH) in soft water and RO water sources.
Dosing: 1 tsp into 10 gallons will add 2dGH
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How much and how often should this be used say for a 90 gallon tank I am currently dosing using the estimative index technique.
its designed to raise your general water hardness so it depends on your water supply. You'd need to test that with a GH test.