High PH

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Gvanalstine

Gvanalstine

0
Jun 21, 2017
9
Sahuarita, Arizona
Hello all- I have went to school and been following for a year now. I am a converted "liquid bleach pool guy" this year due to my CYA up for the first two years of owning the pool. I have been really impressed on how it has balanced out.

I have a 11,000 gallon, pebble sheen, pool in which I have a paramount O3 system running 6 hours a day. The pump runs about 8 right now and lilttle more when it gets a 110 degrees.

Hera are some of my numbers for the past few days-

4/17/19
FC-3
PH- 8.0
TA- 100
CYA- 15
CH- 120
Temp-72

4/24/19
FC-1
PH- 7.8
TA- 90
CYA- 15
CH- 150

4/29/19
FC-3
PH- 8.0
TA- 90
CYA- 15
CH- 75
Temp-76

I have been adding about 6 OZ every two days of 29% Acid to keep the PH down but now my CH is falling to. I add beach about every two days as well which averages 45 OZ.

My question is, due to my diet of liquid bleach and acid to keep it balanced, what would make my PH rise every two days? and is the effect of the acid the CH dropping like that? I live in a very hard water community (due to a local mine) and this drop is pretty shocking to me.

Your thoughts are appreciated.
 
Gvanalstine said:
My question is, due to my diet of liquid bleach and acid to keep it balanced, what would make my PH rise every two days? and is the effect of the acid the CH dropping like that?
Click to expand...
Welcome to TFP! :wave: Well, my first concern is the dropping CH because CH won't just fall on its own unless there's a leak. So we don't want to think of that. Can you update your signature please and include which test kit you are using? We want to make sure those tests are from your reliable TF-100 (or Taylor K-2006C) test kit before we go crazy. :crazy: Do you have an autofill?

I hope it's not a leak, but that might also explain a potential pH rise if your local water has a high pH. Or ...... if you have water features that create lots of aeration, that could do it as well. Finally, your TA is no really elevated, but you have a little room to let it come down by 10-20 ppm. That may also help. By the way, bleach is pH neutral, so if the pH did rise slightly with a little bleach, it should fall back to its original spot later, and not keep rising.

But before we go too far, let's see what you are using for testing and make sure there's no leak or anything else odd happening.
 
Sorry, I will update that. I test with a Taylor K-2006.

Also, I just had it drained three months ago to get all the CYA out and refilled. It was a battle to get it balanced out but it has been pretty predictable with the PH at 7.8 every couple of days. I do have an auto-fill on the pool and had some left over chlorine pucks that I have been trying to get rid of in a floater, ever since I refilled it. I have finally ran out today. From here on out it will be only bleach.

It has been very windy for the last month with most days around 16MPH. I don't know if I can blame it on that.
 
Well, I'm still a bit worried about that CH drop. The fact you have an autofill and were using pucks for a short time (acidic and should lower pH) still has me concerned. Something you might consider ..... turning off the autofill and doing a bucket test to ensure you're not losing water. Your next water bill might also be a clue. CH simply won't drop unless you change water, and evaporation won't do it either. For now, do the best you can to manage your levels, but I woulod monitor the water.
Recommended Levels - Trouble Free Pool
Leak Detection - Trouble Free Pool
 
Is your fill water coming from a water softener?

Also, CYA at 15 is not measurable. 30 ppm CYA is considered the minimum for an outdoor pool.

At your location you may be able to survive at a lower CYA, but I would suspect you would have less chlorine loss at 40 or 50 ppm CYA.
 
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