Adding a lot of chlorine, FC not moving much

[brunoforestier]

Backstory:

I wanted to increase CH from 150, and did that by adding calcium chloride (sprinkling in deep end, brushing afterwards). Now the CH is 210, so that's fine for now.

While brushing my deep end (something I hadn't done since I've owned the pool across the last 5 years), I am wondering if I didn't kick up a bunch of "old" debris.

My FC hasn't been above 1.0 since brushing/adding CC. I've added 128oz of 10% bleach since the CC addition (in 64/32/32 increments over time). Typically adding 64 oz of bleach would get my FC level to near 3. It was 0.5 an hour after adding the 64 oz yesterday.

What gives?

 

[YippeeSkippy]

How about a complete set of test results??
FC
CC
pH
TA
CH
CYA

Maddie

 

[JJ_Tex]

^ what she said. Also, what is the date of your 10% chlorine.

 

[brunoforestier]

FC 1.0
CC didn't test
pH 7.8
TA 110
CH 210
CYA 0 (indoor pool)

I didn't measure CC (haven't for months) as I've been keeping very good tabs on my pool chemistry and found CC to be generally useless.

 

[brunoforestier]

^ what she said. Also, what is the date of your 10% chlorine.

The date's rubbed off. It's part of a large batch of bottles I got from WalMart in May, and haven't had problems with the others.

 

[YippeeSkippy]

Actually, your "useless" CC result would be the first hint that something was hinky in the water. I'd strongly suggest performing that test when you're asking about problems with chlorine balance.

Maddie

 

[brunoforestier]

CC 0.2
FC 1.0
(just measured now)

 

[YippeeSkippy]

Have you added any other pool store type "potions" ? Some potions chew up chlorine but they never tell you that at the pool store when the sell it.

Maddie

 

[brunoforestier]

I have not -- but it's hard to say what was lurking in the bottom of the pool when I brushed it all up.

I'll keep pouring more than the usual amount of bleach. Any other ideas as to what I can do at this point?

Thanks!

 

[brunoforestier]

My pool has seemingly returned to its normal self over the past few days.

I do seem to recall CC generally being zero in the past, and was always zero, which is why I stopped measuring regularly. Over the past week it has been consistently 0.2 -- should I be worried?

 

[Jeff J.]

FC 1.0
CC didn't test
pH 7.8
TA 110
CH 210
CYA 0 (indoor pool)

I didn't measure CC (haven't for months) as I've been keeping very good tabs on my pool chemistry and found CC to be generally useless.

TFP actually recommends some CYA in an indoor pool, about 20. It buffers the chlorine. Without it, the water can be very harsh on swimmers and clothes.