hi all back again . have some green in pool

[aylad]

Your ideal readings for chlorine are determined by your CYA level...see the link in my sig for the "best guess chlorine chart" for more information there. With a CYA around 30 or so ppm, a FC of 12.5 is a little high, but you can swim in it--I just wouldn't wear a brand new bathing suit. And, in a day or so, that level will have dropped down closer to the "recommended ranges" for chlorine for that CYA. But I certainly wouldn't panic over it......

[airraid1999]

will run another test in morning to see if cya rise at night just am not used to having high fc that's all i have grand kids that have bad allergies and we went through a time last year that there eyes bothered them but i really don't think it was chlorine? i worry about them that's all and since school is out they will be over more just wanted to get ideal readings before they come over daily thanks for everyone's help!!!!

[aylad]

If you haven't added any more CYA, then it's not going to rise overnight--save the reagent until you've added some CYA, and then give it a few days to dissolve before testing for it. The FC will not stay that high for very long, with a low CYA. One or two days of sun should bring it down substantially (in my pool, it would only take one day!! ). When eyes are bothered, it's usually because the pH is too high or too low, or because the pool has lots of CC due to inadequate chlorination. A properly chlorinated pool shouldn't be hard on the eyes.

[airraid1999]

that's what i was told last years the ph should be more of issue than chlorine thanks will wait and check again in a day or so would you suggest adding stabilizer? never really had a cc problem

[aylad]

the ph should be more of issue than chlorine

The pH is not necessarily more, or less, an issue than the chlorine. Get the pH in the 7.0-7.8 range, and as long as it stays there, you're fine. The chlorine, however, will need closer attention because if it gets too low, you'll end up with a green pool.

Also, the stabilizer doesn't really have anything to do with CC....the CC is just chlorine that's engaged with fighting "goo" in the water. The stabilizer protects your chlorine from being consumed by the sun. If you have an acceptable amount of chlorine loss during the day (2-3 ppm?), and you're able to chlorinate your pool on a daily basis, then leave the stabilizer alone. HOwever, if you are losing too much chlorine to the sun, or need to chlorinate your pool less often then daily, then raising the CYA can help with that. Really, it's just personal preference. The important thing to remember, though, is that the amount of chlorine you must maintain is dependent on your CYA level. (Repeating my advice to check out the chart I referenced above).

[airraid1999]

morning #s after a backwash last night
fc-11.8 did the 25 ml sample i got plenty of reagent also plenty for cya
cc-0.0
ph-7.0
ta-110
cya-35
temp-88

[aylad]

I'd go swimming