How much muriatic acid do I add to lower pH?

The amount of muriatic acid needed to decrease pool pH will depend on your pool’s water volume, pH level and alkalinity level. Remember that when you lower alkalinity, the pH will follow. You’ll need approximately 35-60 fl oz of muriatic acid per 10,000 gal of water to reduce alkalinity by 10 ppm.

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How long does it take for muriatic acid to lower pH?

Chris, just make sure the pump is running when you add the muriatic acid, you can swim in 45 minutes. It doesn’t take long for it to dilute.