PH and chlorine level

[miwitte]

Haven't posted here in quite a while because frankly things are great! I only just went in the pool this week so have only been really watching PH religiously for a month or so. One thing I noticed was if chlorine is lower say 2PPM my PH was perfect at 7.6. However going up to 7 where it should be based on my CYA my PH is now 7.8 or more. Can adding bleach raise PH? I know once you get to 10 ppm on chlorine PH is off but shouldn't be at 7ppm. Also is there a better way to measure PH like the drop test in the chlorine FAS-DPD kits. Its so subjective to what color the PH is.

Also fighting some staining I was using some vitamin C tabs and stainfree in a sock to remove it as I had a large party last week and no time to figure out the right way(which I need to work on) I did notice though that after doing this it ate my chlorine up so good thing I read to check chlorine.

 

[OTPirate]

You can try a pH meter..they are a lot like wine..you can spend $10 or $1,000. I'm comfortable with my less than $20 one, but I use it in conjunction with the drop test. Most pH meters come with a "standard' (a solution or one you can make with a set pH to calibrate and to test your testing methods and/or reagents).

 

[jeffbrig]

Yes, adding bleach also increases ph. However, there is no net change. As the bleach/FC is used up, ph returns to its prior level. The ph rise from bleach is one of the reasons to recommend adding acid (and letting it mix) before chlorine.

 

[needsajet]

pH does rise a wee bit with addition of chlorinating liquid, but then drops back down as the chlorine is exhausted.

Pool pH at 7.8 is fine, and you can consider adjusting pH when it goes higher than 7.8

Here's an article on stains: Pool School - Metals in the Water and Metal Stains