Converting to salt...part II

[JoyfulNoise]

Looks good. Expect some burn off during the day due to UV loss and then get ready to do another OCLT tonight.

 

[300winmag]

should I treat for an FC value of 10 this evening, and test it again in the AM? Or just note the FC before going to bed, and test it in the AM?

 

[Mr Bruce]

Option B

 

[300winmag]

Just tested it again. FC is now at 5.
Isn't that a pretty large drop in a short amount of time?

Weather today is 100% sunny, and 90 degrees.

 

[Mr Bruce]

Yeah. You can do an OCLT to be sure but I'd bet good money it won't pass.

 

[JoyfulNoise]

Just tested it again. FC is now at 5.
Isn't that a pretty large drop in a short amount of time?

Weather today is 100% sunny, and 90 degrees.

Yes, it is quite large. But your CYA is also quite low for your climate and sun can be brutal towards FC. This is why your really going to have wait until tonight when you can perform another OCLT. When you do, I would just try to shoot for an FC level of near 5ppm or so (a little higher is ok) when the sun goes down and check it again in the morning. Then we'll know what your loss rate is. Just remember to keep the pumps running and the SWG turned off overnight.

 

[300winmag]

should I retest CYA, or doesn't it really matter until the OCLT is completed?

EDIT: for clarification, the SWG is off. Has not run since I shut it off yesterday.

 

[JoyfulNoise]

CYA is not important right now. No need to test it.

 

[300winmag]

assuming the OCLT does not pass... what does that mean? That I still have organics that need to be destroyed via a SLAM, or something worse?

 

[Piolin]

If you don't pass OCLT, just slam, remember to lower the pH to 7.2 when FC is below 10, and then slam..

 

[300winmag]

just tested FC again; now 1.5.

I'll dose it up to 5 at sunset, wait 10 min, retest and dose again accordingly. I'll test it 60min after that, and again in the AM.

Thanks for all of your help.

 

[JoyfulNoise]

10mins isn't really sufficient time to mix. I'd just dose it to 6 or 7ppm, then wait 30-45mins and recheck. Whatever FC level it is will be fine. Then check again in the morning.

My guess is, the loss will be big.

 

[300winmag]

Treated the water at sundown (~30min ago), and tested it just now. FC is 6.

 

[JoyfulNoise]

See you in the AM.

 

[300winmag]

0545; FC is between 5 and 5.5.

 

[Mr Bruce]

Your last CYA measurement was somewhere between 40-50? (In which case you round up to 50).

 

[300winmag]

Yes, last result was 45. I will test it again now.

- - - Updated - - -

Still between the 45 and 50 marks. Closer to the 50.

 

[Mr Bruce]

I don't think the sun is up there yet CYA test needs full sunlight.

Still, sounds like you probably have enough CYA to prevent that kind of daylight loss.

 

[300winmag]

well, shoot. I don't think I have enough r-0013 to run another CYA test in the sun. I ordered a 16oz bottle, but the good old USPS delivered it to the wrong address yesterday. Hopefully it shows up today, but even if it does, it won't be until this afternoon.

Assuming my CYA is high enough to prevent that kind of daylight loss, what else could I be dealing with?

 

[Mr Bruce]

Two things use up FC, the sun and organics. Organics come from algae, bather load, etc.

Were there lots of people in the pool yesterday? What does the water look like again? Can you post a picture of the water?