Just came from the pool store. Man says my pool has a chlorine demand.
I.G. 20×40 vinyl
24,800 gal.
Test results:
total chlorine 2.7
free chlorine .0
Ph 7.4
t/a 155
total hardness 53
CYA 40
TDS 500
Temp. 85
Saturation Index -0.5
He’s running another test and will call me in the morning with
results. But He said that the way it looks right now, I have 2
choices. Which are:
1) Drain down to the first step level and refill & retreat, or
2) Add a massive dose of Chlorine (maybe as much as 100#)Which may
lead to other things becoming unbalanced.
Your comments, Please
Thanks, Arlee
Chlorine Demand
May 15th, 2007 · 1 Comment
Tags: chemicals
1 response so far ↓
1 Adeline Sang // May 16, 2007 at 6:38 am
from those test results it sounds like you have what is referred to as
chlorine lock or combined chlorine. combined chlorine has a very
chloriney smell because it is actually chloramines. chloramines are the
used up form of chlorine. you need to have free chlorine which can only
be tested for with a dpd test kit. most homeowners use an oto test
kit. anyway, i don’t think draining will help that problem the only
way to get rid of chloramines is to use breakpoint chlorination, also
referred to as shocking or superchlorination. 100 pounds sounds like a
ridiculous amount to achieve that though. perhaps he meant ten pounds.
I would recommend shocking and then retested a day or two later.
personally, i would increase my cya and lower my TA based on those test
resuls.
Paul
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