Adding chlorine after muriatic acid timing.

[Scarecrow]

23,000 gal pool and hot tub. 0645 this morning ph >8, chlorine 0-.5. Added a gal muriatic acid. Heavy use yesterday. Thanks

 

[mknauss]

With pump on wait 30 minutes and add chlorine.
Next time, add chlorine first.

 

[Palpatine]

A gallon seems like an awful lot... how did you figure you needed so much?

 

[Scarecrow]

In the past seems like holding my ph closer to 7.2-7.5 the chlorine holds better. In the past at 8+ a gal brings it down to about 7-7.5. We are expecting thunderstorms this afternoon. Rain always seems to raise ph. Thanks any other thoughts?

 

[Scarecrow]

It is 23000 gal

 

[Palpatine]

In the past seems like holding my ph closer to 7.2-7.5 the chlorine holds better

I'm not sure that's a thing... but I'm no expert.

I was just curious cause when I add less than a quarter gallon is affects my PH pretty significantly... like from 8+ to 7.4 - 7.6. My pool is not too much bigger than your pool. But my TA is really low so maybe that has something to do with it. You might want to try the Pool Math app. It's free and should provide some good guidance on the amounts of chems to add to get to desired levels.

Anyways, I'm curious what your PH is now with that much acid added.

 

[mguzzy]

@Scarecrow you should use the PoolMath app to calculate your additions instead of winging it. A gallon seems like a lot to me. By using the old pool math app for a 23K pool only 40 oz is needed to drop the pH from 8.2 to 7.5 (using 20 baum). I would check and see what your alkalinity is now after a massive acid addition like that.

 

[mknauss]

With CYA in the water, the pH has little effect on the chlorine effectiveness.

 

[Scarecrow]

Ok thanks. Is 2 hours enough time to retest?

 

[mknauss]

With pump running you can retest after 30 minutes for FC and pH. You do not show what pump you have, so you might brush the pool during that 30 minutes to completely mix it up.

 

[proavia]

What test kit are you using?
Can you post a current full set of test results from your own test kit?

FC
CC
pH
TA
CH
CYA
Water temp

 

[Scarecrow]

Haven’t been able to find pump rating. Pool was here when bought hose. Test kit is TF-100
Temp 91F noon
FC 0
CC 10
CH 80
CYA 25
TA 130
PH 7.2-7.5

 

[mknauss]

Post a picture of the pump and motor. Any identifying labels, etc. Same with filter. We can help you get more detail in your signature. Add the test kit to the signature.

 

[Scarecrow]

How do I add something to my signature?

 

[mknauss]

How do I add something to my signature?

Create Your Signature - Further Reading

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Your filter is a Pentair FNS Plus DE; pump is Pentair 2 HP Whisperflo