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> I think it started with a Z.

zeolite? https://en.m.wikipedia.org/wiki/Zeolite




i don't think so. It was a brand name of whatever SAP they had decided was safe for plants to bathe in. I found some about a decade ago, just by asking about water retention crystals at an agricultural outlet. I think it's cheaper to buy orbees when they're on clearance, though.




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