Ndx Posted September 16, 2020 Report Share Posted September 16, 2020 Hi Guys, When ALK is to low ... I know we aim for 50, but even at 50 my pH goes up over 8 after one use. Is 40 safe for Acrylic spa. Thank you Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted September 16, 2020 Report Share Posted September 16, 2020 Nobody aims for 50, but sometimes we have to settle for it. What was the ph before you use it? Is the aeration of the jets causing ph rise? Can you close the air controls to lessen the rise? Quote Link to comment Share on other sites More sharing options...
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