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Re: Hot Stone
An old trick I was taught in the RAF:
Dig a hole about a foot deep, part fill with foliage then place a cup in the centre. Cover the hole with plastic sheeting, place a small stone near the centre above the cup. Water from the foliage will evaporate, condense on the plastic and run down to the cup.
This can also be used on a sandy beach where you dig to the water table, so foliage isn't needed.
Polycarb-glazed greenhouses often get a lot of condensation inside as the plants transpire (?), but I've yet to figure out a way to collect it for reycling to the plants.
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