RichJr Posted March 25 Report Share Posted March 25 Hi all, We have 500 gal hot tub and have had it for about a year now. I have yet to be able to get PH and alkalinity into spec at the same time - as a result I have focused on PH. I have yet to find anyone locally who can help with this issue. If Ph is in spec, say about 7.6, my alkalinity will be about 20ppm. If I bring ALK into spec, say 100, my PH is north of 8.6. When I bring my PH back down (PH down/sodium bisulate), ALK goes too low. When I raise ALK, I am using Sodium Hydrogen Carbonate (baking soda) which I have read is supposed to move PH minimally - in my tub, it moves PH up a lot. I have had my ColorQ system verified by a local shop so I know it is not my tester giving me false readings. For example, the sample I brought to them yesterday, had PH at 8.1 with ALK at 47ppm. I followed their recommendation to bring both in spec(ph down and ALK up), I tested this morning and had a PH of 7.7 and ALK of 25. Has anyone had this issue? Ideas? Thank you Rich Quote Link to comment Share on other sites More sharing options...
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