Marty: What we see here is that people do frequently see a rising pH with SWG systems and end up adding acid or using trichlor pucks. However, the rule of thumb for safe sanitation is the SWG should maintain FC at 5% of the CYA (stabilizer) level. Also, most manufacturers recommend higher CYA levels, from 60 to 80 ppm, usually closer to 80. You'll therefore have to keep FC between 3 and 4ppm consistently. If you have low CYA and your pH keeps going up, Tri-chlor pucks may be the solution. They add CYA and lower pH.
IF your system raises pH and you have to keep lowering it, you MAY see a falling T/A. But frequently rising pH is due to aeration--lots of splashing, water falls, etc. Still many SWG users do comment on rising pH.

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