Sera - GH Test Kit is backordered and will ship as soon as it is back in stock.
Sera - GH Test Kit - 15mil.
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.
This is a great product. The Sera kits are wonderful and not widely available. I’ll be buying more from Nature Aquariums USA