Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural seawater levels. Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly. However, its capacity to perform these functions is dependent on evaporation rate and CO2 concentration.
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Easy and effective. Review by Miami Eddie
My Nano 28G had a low ph problem. Everything attempt to correct it failed until I bought ESV Calcium Hydroxide, Kalkwasser Powder. I followed instructions and added the mixture into my top off reservoir. Within a day the PH was on the mark. (Posted on 9/22/2014)