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Hi, Great instructable, I'll try it, but have a small question, not understood how much water should I add? only the amount to see the soil just wet? or there must be some "visible" water in the sand? also the sand here is normally the gray one (I've seen the white one at beaches) do you know if that fits? or should get the white one? Thank you in advance from your kind answer. Saludos desde Pereira - colombia (Greetings from Pereira - Colombia :-)