Quote Originally Posted by Cal_Newbie View Post
eeeeeeeeeek.......not having fun here.

OK, get the CC to 15ppm...no problem. Get FC to 0, ok. I need to get the Alkaline below 200, so adding acid in small amounts and bubble the water will work that down.... how often shall I check on this process?
You STILL have it backwards: CC is Combined Chloramines...you want THAT at 0. FC is Free Chlorine, the good stuff--free to attack any NEW contaminants. You want THAT at 15. You raise FC by adding chlorine or bleach. There is no way (or reason) to raise CC.

Lowering alkalinity is a simpler process than it sounds if when you know what the steps do. Add the acid to lower pH to 7.0 to 7.2. DON'T GUESS! Below 6.9 will damage vinyl, above 7.2 won't work.

Now, when you lower pH, it pulls the T/A down with it. The bubbling (aerating actually) is the ONLY way to raise pH without raising the T/A as well.

Then, when pH is back over 7.2 (anything from 7.3 on up) you add acid again to lower pH BACK to 7.0 to 7.2 and keep bubbling!

I would check pH a couple of times a day, but I would only check T/A once a day (like about every 2 acid cycles). That's merely a guess and a suggestion. You can measure them both more as long as your test chems hold out.

Don't worry about T/A going too low. From 240 to below 80 will take several days. Besides, lowering T/A is a pain, but there's NOTHING to raising it! Just add some baking soda--regular Arm&Hammer.

When your T/A is good (and I would NOT stop at 200, I would go to a much lower level) you can then raise pH where you want it by adding Borax --20 Mule Team Borax.