For each 20 - 30 gallons, dissolve 1 tsp in a cup of aquarium water. Mix well and add directly to tank or sump each day until the desired pH and alkalinity (carbonate hardness or KH) are reached. Wait 1 hour to re-measure alkalinity and wait 24 hours to re-measure pH levels. Full pH increase and stabilization may take up to 48 hours. After target pH and alkalinity are reached, use at 2 week intervals to maintain values. If you are having trouble maintaining calcium or buffer levels, check to see that the salt mix you are using contains natural seawater levels of magnesium. Low levels of magnesium will result in poor calcium solubility and buffering.