Since soft water tends to have low alkalinity and little buffering capacity, it is possible that adding certain products to a tank with soft water could cause the pH to drop. In most cases, this is not an issue, but with soft and already unbuffered/ lightly buffered water, it could cause a shift in pH. In systems with low buffering capacity or soft water, it is best to use a lower 1/4 to 1/2 dose of many additives and test the impact or outcome before using the full dosage.
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