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Sera gH-Test 15 ml, 0.5 fl.oz. Aquarium Test Kits
Makes it easy to monitor the total hardness
Very accurate
Easy to read
For approx. 420°dGH. In case of too low GH values we recommend sera mineral salt. High total hardness levels can be lowered by mixing in R/O water. For creating soft water we recommend adding sera Blackwater aqua tan or filtering through sera super peat.