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Does anyone have any suggestion as to alternative supplies or whatever that is cheaper. I found one by accident. pH down get get expensive. A little bottle of pH down costs me around $10. I went to a pool/spa/hot tub company and they also had pH down for $7 for 950mg where 10mg treats 1000L. Of course I made sure that the pH down did not have any additives or fillers. I would like to hear of others possibly. I have more suggestions also.