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Completely agree. I only offer it as an alternative for those not comfortable using muriatic acid.Much slower to work than muriatic acid, though. You can strip all of the organics (and a bit of rock, but not much) off in a few hours with muriatic. I like seeing all the organic matter denatured and collecting as a thick brown foam on top of the water. It's true vinegar is safer, because it's a more dilute solution of a weaker acid. But they're still both acids and you can dilute muriatic down to whatever concentration you want to use.