SWG - ph always normal?

[PatL34]

You have me confused too as I have a DiamondBrite pool, and am having to maintain the pH using Muriatic acid which is part of the electrolytic process.

To maintain a steady pH, you either have to use acid, or salt to replace the salt that is used in chlorination. Adding salt by itself, should eventually lead to a rise in pH as caustic soda is being formed, and has to be neutralized with Muriatic acid. Using dry acid will also neutralize the caustic soda and lower pH, but raise the TDS.

To have a constant pH, something has to be depleted to keep the Cl level constant. Any upsets will affect the Cl level, requiring extra chlorination. This will affect pH as something has changed regardless of being a vinyl or concrete pool.

I would do a check as to what has to be added constantly to maintain this pH level, because everything I am seeing from this thread does not make sense according to the laws of physics.

Pat

PS: Noticed that Nater is adding salt to maintain the correct level. Ok, that accounts for the change I was expecting, but the pH should have started to go up, as more caustic soda is being created, but no acid is being used to neutralise it to keep the pH constant. Somewhere there is a control or buffer keeping the pH steady.

Oh boy, more research!!