PH

[debt.disappear]

Good morning pool peeps. So I recently learned that a pool with a SWG will always have PH that rises over time. I honestly had no idea about this part and have been scratching my head adding muriatic acid so often. If I am not correct in this please let me know.

Anyway, the question is this. Is there any method, product or device that would allow for regular, small doses of acid to be entered into the system? I am away a lot and my pool us fairly stable. PH is the main issue for me.

Thanks guys and gals




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[Denniswiseman]

You can get an acid doser but have you checked that aeration, waterfall and infinity edge all cause ph to rise
Also lowering your TA should help

[debt.disappear]

Agree on aeration, but what do you mean by check it? I have laminars that are used about 6 hours per weekn

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[Denniswiseman]

That would definately raise your pH
Try leaving off and see if the ph remains stable for that period of time
Otherwise you will have to continue dosing acid manually or automatically

[debt.disappear]

Will do. Truth is I even have a spill over from spa to pool. It doesn't great significant aeration but it all counts. Thanks!

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[revitup]

Had the same issue with rising PH until I lowered TA to the 60-80 range. It's nice and steady now, Also noted that it wants to stay around 7.6-7.8 and so stopped trying to drive it down any lower.

[Denniswiseman]

Had the same issue with rising PH until I lowered TA to the 60-80 range. It's nice and steady now, Also noted that it wants to stay around 7.6-7.8 and so stopped trying to drive it down any lower.

That makes sense accept what your pool needs and go with it

[dynamictiger]

I recently learned that a pool with a SWG will always have PH that rises over time

This is not true. It is a rumour at best.

It is based on something along the lines of SWG make chlorine in the form of sodium hypochlorite. Sodium hypochlorite we purchase as bleach makes the pH increase. Therefore SWG makes the pH increase.

The difference is the bleach includes a small amount of hydroxide to stabilize it and prevent it loosing strength too quickly. The pure reaction occurring in the SWG is pH neutral.

It is more likely the pH changes observed and blamed on the chlorinator are caused by other factors such as aeration and other substances making their way into the pool.

[Teapot]

It is true, the off gasing of carbonates raises pH, and aeration from the chlorination conversion also raises pH.
The reason is most pools are over carbonated (high alkalinity) reduce the alkalinity and the problem goes away. I set up a test rig to prove/disprove the theory.
With alkalinity at 120 the pH would rise in a few hours and generally stop around pH 8.1. Using lower alkalinity at 40ppm the pH was stable after 48 hours of aeration.
Using a slightly higher pH on outdoor pools with CYA present reduces the calcium saturation index to a safer less aggresive level for plaster/tiled pools with no effect on sanitiser effeciency provided ratio of free chlorine relative to CYA are observed.

[dynamictiger]

In a fiberglass pool try running low TA and the pH wont move using a salt chlorinator.