does chlorine burn off faster when it's at high level?

[joemkraus]

I just finished my slam after 3 days I had 0 oncl and 0 CC this morning. FC was at 17, but later in the day it went down to 9. I also had a little bit of CC maybe 0.5. since my slam is done going from 17 to 9 seems like a lot of loss of fc and I was wondering does fc drop faster when it's at high levels because dropping 8 points in one day seems excessive

 

[ajw22]

Yes, but usually not that fast.

Has your pool passed a Overnight Chlorine Loss Test?

 

[wireform]

Joe, Can you post a fresh set of numbers. That may give us a clue.

 

[joemkraus]

yes as mentioned as no loss on oncl test

 

[joemkraus]

now fc 9. cya 40. ph 7.5, ta 100, cc 0.5

 

[joemkraus]

FC was 17 this morning

 

[wireform]

Where is your CYA at.

 

[joemkraus]

40 as I listed

 

[JamesW]

It's based on the fc/cya ratio.

Double the ratio, double the loss, all else being equal.

 

[joemkraus]

OK, so it should level out to a more slow FC burn off as it gets closer to my target of 7? Just to understand

 

[wireform]

Yes that is correct.

 

[joemkraus]

thanks much

 

[Richard320]

OK, so it should level out to a more slow FC burn off as it gets closer to my target of 7? Just to understand

If you really want to get into it, there's this thread. Scroll down around the fifth graph.