Best CYA Level for Lots of Sun - Location Hawaii

[chazas]

I don't have my "pool book" any more, but to the best of my recollection I ran the pool at around 40-50 PPM CYA.

I tried to keep a minimum FC reading of 3 PPM. I had a 17,000 gallon pool. As best as I can recall, I think I used a couple of the smaller bottles of bleach every 3 or so days. But I don't remember exactly - it's been about a year and a half and I don't have a good memory for numbers.

Bleach did keep my pH on the increase - to the best of my recollection, it would usually go up to 7.8 or a little more during the course of the week, and I'd add about 3 cups of muriatic acid (available from the Ace hardware store on Kaimuki) on the weekend, which would bring it down to 7.5ish. The only time I ever had to worry about increasing pH was when I returned from a vacation after having used a floater with pucks. But I tried to avoid that because it tended to increase my CYA pretty dramatically.

Honestly, I don't think being in Hawaii should impact your pool care regimen too much - summer on the Mainland can have much more extreme conditions.

[smallpooldad]

With CYA now at 50 ppm, CL is dropping from 5-3 over 24 hour period. This requires 40 oz bleach a day or 2gals and 24 oz a week. I am planning on raising it to 60 ppm to see if that further reduces the chlorine need. At that point I will not raise it any higher.

Add 8 oz a day of muriatic acid to keep the pH at 7.3-7.4 for iron stain control.

Will advise on results.

[DavidD]

Boy that's ridiculous. If I were you, I'd trade my house and pool even for one in say, middle Tennessee and let that poor sap deal with it......
Interesting enough, I have raised my CYA to 50 as well and have noticed identical FC loss as you, about 2 ppm a day on a cloudless day. This surprises me as I thought the UV degradation would be slightly higher at the lower latitude. Let us know how 60 works for you.