Quote Originally Posted by Guido
Hi everybody just starting with my first season with my, last fall finished, 22K IG plaster pool. Cartridge filter and SWG. We opened 6 weeks ago and the water went from very cloudy with in 1 week to crystal clear. With the SWG came the first set of Salt which I added after the temperature stayed at around 64. The builder added balancing packs into the pool to get my CYA and TA up and I’m constantly adding acid to keep the PH down. My TC was at around 6 with the SWG setting at 20%. Last night when I started the pump I switched without noticing it the SWG to boost and was running 18 hours. (Just got back from work).

Here are my figures from today. Measured with Taylor kit. (PS234s ordered)

Temp water=71
Temp outside=74
CYA=70
TC=15
FC=15
PH=7.3
TA=150

Beside the ph everything looks to me off scale but my water is crystal clear.
What should I do from here? I tried to find similar posts here but I was not able to.

Any hint were to look or what to do is highly appreciated.

Guido
OK, your numbers aren't as bad as you think. You CYA is VERY high, but with FC=15, your water is nearly at shock level. That's OK. CYA of 70 means your need to follow Ben's Best Guess Table for FC levels. I believe 6-10 FC is best, and 20 to shock. Still, all FC of 15 will do with a CYA of 70 is fade a few bathing suits--nothing to worry about. You can ABSOLUTELY swim in in safely. I'll bet it doesn't smell like chlorine either! From now on, do NOT use any CYA raiser, or Di-Chlor powder, or Tri-Chlor pucks. They will raise CYA and you have MORE than enough. They will lower pH and 7.3 is the bottom of normal anyway.

Your Total Alkalinity is too high for a concrete pool. Were it vinyl, I'd say you're FINE. But 150 is pushing your luck a little on concrete--it's probably OK, but it could cause some scaling. But with pH of 7.3 it won't take much to get it down. Just follow the procedure in the Alkalinity forum and get it to 130 or less.

You didn't list Calcium.. in Your pool you should aim for 200-400ppm. Less will leech calcium from your pool walls, more will cause scaling, ESPECIALLY if your T/A is too high.

But, as I said, overall you are in GOOD shape and in no danger of an algae bloom---as long as the ##s are accurate.