OCLT if heated to 85

[engrav]

pool is fine but will try OCLT for fun but...

if pool is heated to 85 will OCLT still be accurate
or
does chlorine off gas at 85 degrees even if it is dark

thanks

 

[jblizzle]

My pool is warmer than that. The temp should not affect the OCLT.

 

[engrav]

FC did not change overnight, was 1 at dark and 1 at daylight. So with vitamin C test (neg) and chlorine tab test (neg) would appear just have old old old plaster. Thank you.

 

[GreatCanadian]

FC is 1? Do you have CYA (stabilizer) in your pool?

 

[engrav]

FC is 1? Do you have CYA (stabilizer) in your pool?

CY is 30
but had not added bleach for couple of days so it had drifted down
really sucks up a lot with sunny weather and pool temp 85

added bleach today as per PoolMath

thank you

 

[GreatCanadian]

Where/how are you getting your test results?

 

[engrav]

Where/how are you getting your test results?

Have K2005 and the TFP chlorine kit (Chlorine FAS/DPD)
latest are
FC 1
pH 7.6
TA 80
CH 250
CY 30

last 3 rarely change
am always adding bleach and acid, would be nice if did not have to add so often, I guess they "off gas"

bleach is cheap stuff 5.25% from the local hardware, am collecting too many empty bottles, recycle them all is painful

 

[jblizzle]

Your FC is too low to prevent algae. See the FC/CYA chart in Pool School. That FC is really too low to do the OCLT in my opinion.

 

[engrav]

Your FC is too low to prevent algae. See the FC/CYA chart in Pool School. That FC is really too low to do the OCLT in my opinion.

True, I shoot for FC5. But I was away for two sunny days and woompf, it dropped to 1.

Not sure what to do when away as can't add jugs of bleach and the Rainbow is turned off. Maybe I need a liquid chlorine feeder.

Perform the Overnight FC Loss Test (OCLT) directions do not mention a lower limit for FC. But I will try it again at higher levels. Water and the walls look Ok.

 

[jblizzle]

The OCLT was written assuming you are trying to check if you are done with the SLAM process so your FC would be high. I would suggest raising your FC to around 10ppm and checking the OCLT. If yoy are going to be gone. You should raise the FC up to SLAM level and cover if possible.

 

[engrav]

The OCLT was written assuming you are trying to check if you are done with the SLAM process so your FC would be high. I would suggest raising your FC to around 10ppm and checking the OCLT. If yoy are going to be gone. You should raise the FC up to SLAM level and cover if possible.

got it, will test when FC higher
got it, will raise higher when I leave for a few days

but
last summer used chlorine tab feeder, now have moved to bleach
buy 5.25% bleach at local hardware
but would seem I will need 1.5 jugs / day; that is 45 / mo; at 6 per box that is 8 boxes / month transported and stored

there must be a better way to add liquid chlorine, liquid chlorine feeder?

 

[jblizzle]

Have you shopped for stronger bleach, that does not sound like a very good deal. There are automatic bleach feeders, the Liquidator or the Stenner pumps.

 

[engrav]

good morning

as per jblizzle

I pumped FC up to do the OCLT

was 11 at 7:45 pm, 10 at 8:50 pm and 11 at 5am
pool is clear

would seem I do not have organics eating chlorine, is good

thank you