PH rise?

[Lastrites]

I'm stumped on why my PH keeps rising from 7.4 to 7.8!!! Every week, I have been adding 15-17oz (Muriatic Acid) to bring the PH back down to 7.4 and what do ya know, we never stay put!!! Hopefully someone here can help me understand why this keeps happening. I use around 50oz. of bleach every evening after I run my water test.

FC= 3
PH= 7.8
TA= 100
CH= 200
CYA= 40

 

[Richard320]

A pint a week? Hah! That's child's play. You are not alone...

My guess is you have hard water. You probably also get a lot of aeration from kids. Or a slide.

Keep plugging away at it, eventually your pool will settle down into the sweet spot where pH flatlines for a week or two at a time. Although every time you add water, you disturb that.

 

[anonapersona]

Re: PH rise

Try going to pH 7.2 when you adjust pH. Your TA is still a bit high and if your pool has much aeration, as in a spillover spa, or jets that break the surface of the water, that agitation combined with the TA drives pH up quickly.

I have all those, and now with TA at 70, ph is much less of a problem. That is, we add acid every 3rd or 4th day.

 

[lightingguy]

TA buffers your PH but it also acts as a source of rising PH. Most pools are chlorinated with TriChlor pucks which are acidic so most places will recommend a highish TA (100 or so). Since you are using bleach you dont have this source of acid and must compensate with MA.

As Anon mentioned - if you were able to drive your TA down to 80 or even 60 you may find your rising PH problem gets better.

You can also consider adding borates to your pool. This wont affect the total amount of acid you add over time, but will slow the rise in PH.

What;s the TA of your fill water?

 

[supertune]

My pool did the same thing. See link here:http://www.troublefreepool.com/what-chemical-to-use-first-t36092.html