Makes it easy to monitor the total hardness in fresh water.
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 aquatan or filtering through Sera super peat.
Test solution volume of 15mL, 1x test vial and instructions