Cant hold chlorine

[herrmanncr]

What's the rule of thumb when adding Borax? 21000g inground vinyl. Thanks!!!

[Watermom]

Depends on how low your pH is. Yesterday you said that it was at 7.0. If that is still true, in this 21K gallon pool I'd probably add a half a box. Let it circulate for a few hours and then retest. See how much that moves it and then add smaller amounts to tweak it where you want it.

[peekaboo]

darn ,beat by Watermom by 5 minutes

[aylad]

darn ,beat by Watermom by 5 minutes

Yeah, you gotta watch her, she's quick!

Janet

[CarlD]

Gets the jump on me all the time!

[herrmanncr]

OK, got test kit on order (K2006C). Meantime had pool store test at 3pm.
FC - 0.1
TC - 0.6
CC - 0.5
ALK (adjusted) - 117 (input) - 148 not sure the difference
PH - 7
Hardness - 377
CYA - 92
Sat index - -0.13 don't know if needed

5pm - added 1.5lbs Borax
830pm - added 4 - 1.42 gal bleach (5.68gal) 6% hypochlorite
Will check with strips and add 4 more before work WED morning if not holding. Test kit will take a couple of days so will drop sample off at store and have tested to get #s. Will post them once I have in hand. Again thanks and let me know if this is a good start or anything else to do. 21000 gal ingrnd vinyl.

[aylad]

This is a good start, but you're not going quite high enough with the chlorine to actually burn off the demand. You need to get to 20-25 ppm, since your CYA is so high. Since each gallon raises Cl by 3 ppm, that means you need 7-8 gallons in at first, then to add more at dark and in the morning to get back up to the 20-25 ppm. It will go faster if you can also test and re-add 2 or 3 times during the day.

Since your CYA is so high, you really need to consider draining and refilling about 1/2 your water, because even when you get the chlorine demand worked out, you're still going to have to maintain 8-15 ppm Cl at all times to keep the algae away.


Janet