chlorine evaporates

[TJTJ]

hello all - my chlorine will not last in my pool. My #'s are as follows:

CYA= 35
CC=0
CH= 330
TA=90
PH=7.3

I have plenty of CYA and it hasn't been hot here. Don't know what to think..... Any help will be appreciated. Thank you
chlorine is zero. I added chlorine last night

 

[Richard320]

Even in a pristine pool with no swimmers, you're going to lose about 2 FC per day, minimum. Up to 4 is nothing exceptional. It may be cool, or even overcast, but if UV is getting through, you;re losing chlorine. I can attest that it is possible to get a crippling sunburn even on an overcast day. The UV finds a way through.

Raising CYA to 50 should help a little.

 

[YippeeSkippy]

What form of chlorine are you adding?

 

[Poolzzz]

How much does your chlorine drop overnight (before sun hits pool in morning)?

 

[jblizzle]

What test kit are your using?
You did not report FC.

 

[TJTJ]

What test kit are your using?
You did not report FC.

TF - 100
FC=0

all of the chlorine evaporated within 24 hours

 

[TJTJ]

What test kit are your using?
You did not report FC.

What form of chlorine are you adding?

How much does your chlorine drop overnight (before sun hits pool in morning)?

Have not tested for overnight loss. all the chlorine is lost within 24 hours

 

[TJTJ]

What form of chlorine are you adding?

granular -cal hypo 73

 

[Richard320]

Have not tested for overnight loss. all the chlorine is lost within 24 hours

But how much is that? If you add only 3 ppm and it;s all gone in 24 hours with 35 CYA, that's hardly worth getting excited about. If you added 20 FC and it all got used up in 24, there's a problem. How much cal-hypo are you adding?

And is it fresh stuff? Not all clumped up? Can you smell the fumes? No chance it got wet over the winter?

 

[jblizzle]

Chlorine does not "evaporate" from a pool. It is consumed by breaking down organics in the water or lost to the sun.

 

[TJTJ]

But how much is that? If you add only 3 ppm and it;s all gone in 24 hours with 35 CYA, that's hardly worth getting excited about. If you added 20 FC and it all got used up in 24, there's a problem. How much cal-hypo ar e you adding?

And is it fresh stuff? Not all clumped up? Can you smell the fumes? No chance it got wet over the winter?

Yesterday I added 10 ppm, just a few minutes ago I added another 15ppm. Not sure why all 10 ppm of cal hypo evaporated. Could it be a bad batch of chlorine?

 

[TJTJ]

Yesterday I added 10 ppm, just a few minutes ago I added another 15ppm. Not sure why all 10 ppm of cal hypo evaporated. Could it be a bad batch of chlorine?

I just recently purchased. no clumps.

 

[mknauss]

With that much loss at a CYA of 35, you need to follow the SLAM Process

If you want, do an Overnight Chlorine Loss Test first.

 

[YippeeSkippy]

Not likely.....more likely you have organics in the water chewing the chlorine up.

M.