water hardness

[sthawke1]

how do you make water harder?? other than adding cuttlebone

thanks,
john

 

[daveedka]

Cuttlebone won't do it, too slow.

Add cAlcium and magnesium to increase hardness.

Add Carbonate to increase KH and pH

Crushed coral will do both nice and slowly. Crushed coral is CaCo3 (Calcium Carbonate)

Dave