Do you think it is good idea to put some kalkwasser in CaCl2 solution and to remove the residue. The goal is to purify solution from heavy metals/phosphates that could be present in CaCl2.
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Sounds good.
You might measure the pH of the concoction if you have a meter available. We could calculate the hydroxide present at saturation (and Jim probably will ), but a measure would be nice too.
Happy Reefing.
Yes i'll do that, but what will happened if the solution contains MgCl2? I suppose Mg(OH)2 will precipitate and since is more insoluble than Ca(OH)2 will lower pH?
Thank you Jim very nice video, yes recrystallization is another very good option despite fact that certain amount of the calcium chloride will be lost.