TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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Blasting sand and flint sand are quartz sand without the carbonates or other minerals that would boost the pH beyond what most CPs prefer. Swimming pool supply stores seem fairly abundant, so filter sand is probably the easiest to find. It's pricey, but that isn't such a concern when potting a few plants. But if you need a lot, say to construct a bog, it would probably be worth tracking down a blasting/flint sand supply.