8 Gallons of 6% to shock ???

aswetich

Well-known member
May 23, 2007
83
Michigan
I think my pool may have some algae growing and a shock treatment is in order but the bleach calculator says 8 gallons of 6% would be required. This seems like a awful lot considering my pool has a vinyl liner. Does this seem correct ?

* Pool is 20*40 hopper pool with 8.5 foot diving end (25k Gallons??)
* Liner with Aquapure salt system
* Electric Cover
* Water temp is currently 85


Current Readings:
FC 4
CYA 55
PH 7.8

I have been running the aqua-pure at 75% for 15 hours a day and I can barely keep the FC at 4. I turned the aquapure off one evening and took a FC-DPD test and got a 5 for FC, then in the morning the test was 3.5.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
Eight gallons sounds about right given your CYA level and pool size. As long as your CYA level is about right, and you add chlorine as we recommend, there is no risk to the liner at all. Bleach should be added by pouring slowly in front of a return jet while the pump is running. That will mix it into the water very quickly.
 

aswetich

Well-known member
May 23, 2007
83
Michigan
Can I add he Chlorine to the skimmer with the pump running instead ? I poured the bleach slowly in front of a skimmer before and I think the liner got bleached where I did it. It did happen in the shallow end and I know now to do it in the deep end.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,260
Tucson, AZ
Do not pour the bleach in the skimmer.

Pour it SLOWLY in front of a return a foot or so out. Think 2 minutes per bottle.

Posted with Tapatalk ... sorry if I sound short ... hate typing on phone :)