CYA for my scenario

[mgmoore7]

Tampa, FL
Full sun from about 1130am
Screen enclosure
Firing up SWG this weekend


Based on everything that I have read and the recommendations for Salt Water Systems in full sun I need to be at the high end of the spectrum do you agree?

Thank you

 

[Texas Splash]

I would certainly start at a CYA of 70 and if you need more based on FC loss, then increase from there. Always easier to go up than down.

 

[Richard320]

Target 80. But if it turns out mathematically that to do so would require 1.1 canisters of CYA, settle for less so it comes out nice and even. The range is 70-80, so you'd still be covered.

 

[mgmoore7]

Ok, thanks, i am at 50 to 60 now, going to test again now to confirm and see how much more i need, .

 

[mgmoore7]

I am at 60, so i will take it up to 70 and retest

 

[duraleigh]

Well, my experience with screens would actually suggest less. That screen blocks an incredible amount of UV (you have to run your heater all summer, right?)

The UV that actually touches your pool is probably only 70% of a pool without a screen.

I would suggest a CYA of 50 ppm to start perhaps moving to 60 as the summer progresses

 

[mgmoore7]

Well, my experience with screens would actually suggest less. That screen blocks an incredible amount of UV (you have to run your heater all summer, right?)

The UV that actually touches your pool is probably only 70% of a pool without a screen.

I would suggest a CYA of 50 ppm to start perhaps moving to 60 as the summer progresses

You are correct that it blocks about 30% of the suns rays. I don't think I will need it through the summer unless I wanted the temp regularly closer to 90 but time will tell. We seem to like the temp between 84 and 86 as adults. Kids are fine down to 80 or so for sure or even less. We will probably be setting the solar to cut off at about 83 and let the sun heat is up a few more degrees through the afternoon. Right now it is dropping down to about 79 overnight.

The last several days, I have been losing 3-4 ppm of Chlorine daily I believe but I have not been methotical about checking the before and after, just making adjustments as needed as I have been bringing my CYA up. It is getting to be about 90 in temperature and we are swimming just about every day and when we swim, it is up to 7 kids with just my family. Today, there were 9 in there for a few hours and went from 5 to 1.5 in CL from last night to tonight.

So, 3 answers, 50, 70 and 80.

I definitely don't want to go too high. Thanks for your help.

 

[bobby1017]

So, 3 answers, 50, 70 and 80.

Sounds like 66.6 to me. With an auto cover I keep 50 / 60, its closed most of the time and it blocks nearly all the light.

 

[mgmoore7]

Sounds like 66.6 to me. With an auto cover I keep 50 / 60, its closed most of the time and it blocks nearly all the light.

Don't like that number much at all.

 

[Richard320]

Well, actually, I missed the part about screened, so 80 is probably too high, even with a SWG.

 

[mgmoore7]

Ok, i had put more cya in the skimmer but pulled it. It is at 60 now and will leave ir there for now.

 

[duraleigh]

I think you will find yourself right in the sweet spot.

 

[mgmoore7]

Ok, thanks