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Sprinkle 0.17 oz. (5 g, one level teaspoon) sera shrimp mineral salt for every 5.3 US gal. (20 l) of water once weekly. The dosage can be increased in case of high mineral requirement or original water low in minerals (including R/O water). A single dose increases the GH by 6.5°dGH at the average. The KH remains unaltered.