A saltwater pool creates chlorine by electrolysis, one by-product is that ph rises as the acid is used in the process, so you will always have feed the pool acid, it’s basically what’s being turned into chlorine.
Quoted form Wikipedia:
Salt water chlorination produces an excess of hydroxyl ions whilst releasing chlorine from salt, which makes the pool alkaline (sodium hydroxide, NaOH, caustic soda). This requires the frequent addition of hydrochloric acid (HCl, also known as muriatic acid) to neutralise the alkalinity and convert the sodium hydroxide back into sodium chloride (i.e., table salt), which can be split by electrolysis again. Thus the consumable supplying all the chlorine is in fact the hydrochloric acid, with the salt acting as a non-consumed intermediary, being split and reformed.
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