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Alkalinity Way Too High


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Due to the malfeasance of someone in my household whom shall remain nameless, my 440gal. spa reached an alkalinity level of 280ppm.  I treated yesterday with SpaGuard pH Decreaser sodium bisulfate (SB) and it's now down to 240ppm.  I know I need to get to 80-120 ppm, so, my questions are: 1. How much of the SB can I add dissolved in a pail of water at a time and how long after the application do I need to wait before testing?  Any other advice would be appreciated.  TIA.

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