shock or not to shock

bdodds

Active member
Dec 28, 2009
34
Columbia, SC
First I am very new to the BBB, checked water on Monday:
ch:240
ph: 7.5
fc: 7.5
cc:.5
ta: 170
cya:90

did a drain/refill

CH:240
PH: 7.2
fc: 1
cc:1
cya: 70

last night about two hours after adding the bleach

fc:7
cc:1

this morning before the sun was on the pool
fc:5
cc:1

Should I shock? How do I know how much bleach to add to get it to shock level? I saw that somewhere on here but I can't find it now. Water is pretty clear. If I am to shock how long before we can swim? Thanks for all the help, I will get the hang of this.
 

woodyp

Mod Squad
TFP Expert
LifeTime Supporter
Apr 17, 2010
10,367
East Texas
Pool school has the CYA/chlorine chart you need for shock level. And yes, you need to shock. Start at dark. Read the shock section in pool school as well.
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
CYA/chlorine chart will tell you your target level, but use Pool Calculator (link in my signature) to determine actual amounts of chemical needed. Set suggested goal levels at the bottom, size in gallons, and enter then enter "now" and "target" for each parameter and pool calc tells you how much of each chemical to add.
 

bdodds

Active member
Dec 28, 2009
34
Columbia, SC
I just put in 985 oz of bleach to shock level. From what I read I check the FC in an hour and then I check it an hour later. How many times do I do this? I know I have to keep the FC to 28 but I am not sure for how long?
 

loughps

Well-known member
Apr 26, 2009
221
Northeast Ohio
You should maintain shock level:

1) Until your overnight FC loss is 1 ppm or less;
2) and your CC is .5 ppm or less;
3) or (if you're not using an FAS-DPD test kit), your pool is sparkly clear.

You should test and bring your level back up to shock level hourly if you can, until it's starting to stay fairly high, then you can cut back to 2 or 3 times per day.
 
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