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HomeSaving Water With A Pumice Wick. Conserve 50% Water Using A Pumice Wick In Planters. A pumice wick is just a tray full of pumice stones in the bottom of your planter. Pumice stones wick water up into the soil, so by saving a little water from running off as waste, and letting the pumice stones do their magic, you will conserve at least 50% on water. Gemma Watering Stones Ltd. 2006 Contact Me.
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