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Re: [APD] sand
>>yes sand does not interact with H2O. Would not be a lot of beaches.
>Sand is mostly calcium carbonate, ie the dead shells of invertebrate animals. Course it dissolves in water! It is what gives water GH and KH. :)
Pool sand is not sea sand IMHO. Sea sand is almost 1/3 shells by my experience and makes the water very alkaline within a week.
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