Adding muriatic acid increased my FC

[stlmuelk]

I'm coming off of a slam after 5 days or so. FC was down to 12 (measured twice over 10 hours) and I knew my ph would be high so I tested it (I know, I know should only be done <10FC) and got 7.6-7.8.
I added enough MA to get to 7.2 and measured chlorine again about 2 hours later and it was 14! Tested again to be sure and got the same answer. I guess it makes sense, but the poolmath app doesn't mention an FC increase in "Effects of adding" so I googled here and also didn't find it. Just an interesting observation.

 

[Sunnydaze]

Chlorine only increases if you add chlorine. There is no chlorine in muriatic acid. Likely the first test showing 12ppm was incorrect.

 

[stlmuelk]

Chlorine only increases if you add chlorine. There is no chlorine in muriatic acid. Likely the first test showing 12ppm was incorrect.

HCl is hydrogen + chlorine

 

[mknauss]

HCl is hydrogen + chlorine

HCl is an aqueous solution of hydrogen chloride. Liquid chlorine is sodium hypochlorite.

 

[stlmuelk]

HCl is an aqueous solution of hydrogen chloride. Liquid chlorine is sodium hypochlorite.

hmmm so there's no possible reaction that can happen that would produce HOCl?

 

[mknauss]

No.

 

[PoolStored]

Testing error.

 

[stlmuelk]

Testing error.

I mean occam says so but it was two measurements separated by 10 hours to get 12 each time. I thought the 14 was the error so I did that one a second time too for 14. That's a 4 drop difference!

 

[PoolStored]

Clean vials. Hold bottle vertical. Use speed stir. Let drops fall under their own weight vs squeezing them out, error in the test (+/-1 drop in 10)...

Had one last week. Guy didn't believe me, so he video taped it...came back and said, "you were right."

I've seen it 1000s of times.

 

[stlmuelk]

Clean vials. Hold bottle vertical. Use speed stir. Let drops fall under their own weight vs squeezing them out, error in the test (+/-1 drop in 10)...

Had one last week. Guy didn't believe me, so he video taped it...came back and said, "you were right."

I've seen it 1000s of times.

Dare I tell you "that guy" was me? Measured just now and got 14 again so I dunno. It would actually make perfect sense if I accidentally used chlorine instead of muriatic acid.

 

[PoolStored]

That is so funny, I have tears streaming, I'm laughing so hard....

 

[PoolStored]

It would actually make perfect sense if I accidentally used chlorine instead of muriatic acid.

I've seen almost everything. Wouldn't be surprised.

 

[stlmuelk]

Well in any case I'm pretty darn sure about 14 so I'm going to pretend this never happened. If a mod wants to delete this it might be a good idea, both to save my embarrassment but also not to confuse someone who doesn't read past the headline.

 

[PoolStored]

to save my embarrassment

Nah, we leave it for viewing in perpetuity.

 

[JJ_Tex]

Nah, we leave it for viewing in perpetuity.

I think the mods should threaten to make this a featured post, unless there is at least a bronze donation

 

[stlmuelk]

I think the mods should threaten to make this a featured post, unless there is at least a bronze donation

Well I did buy the app and Im helping them fix a bug. But yeah I have every intention of a donation soon, it's been a great resource!