Use an app or water analyzer that supposedly gives correct chemical amounts but only gives an amount for pH or alkalinity adjustment.Calculate the amount of alkalinity increase or decrease, add the chemical dose, wait for mixing, and then see what the new pH is.But this only makes the pH 7.5 and does not tell you what the new alkalinity will be after the addition Make an Acid or Base Demand Test to determine the amount of acid or base by counting drops, looking up the amount in a table, and then adding it.Guess an amount of chemical to add, wait for thorough mixing and retest the water in 1-4 hours to see what it did.In the past, you had four choices for making adjustments to pH and alkalinity: The pH – Alkalinity Adjustment Tool is an incredibly accurate tool for adjusting pH and total alkalinity up or down in swimming pools.
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