FC Loss Seems High, No CC

demedeirosa

Member
Aug 10, 2016
10
Boston, MA
Hi All,

I've got a 21ft above ground pool in southern New England. Have been following TFP guidelines and have been quite successful so far. Testing with a Taylor K-2006C kit.

I have noticed lately that my FC seems to drop significantly in 1 day. Data below:
  1. 7/26 - FC=0, CC=0, Added 64oz of 12.5% Bleach (Liquid Shock)
  2. 7/26 - 6AM, FC=5, CC=0, CYA=50
  3. 7/28 - 6AM, FC=1.5, CC=0
Other Parameters taken on 7/24
  • pH = 7.8
  • TA = 100
  • CH = 120
This loss of FC seems very fast to me, although I am not positive, any thoughts? The weather has been between 75-89 the last few weeks.

The other strange thing is that I have never once had a CC reading other than 0. Although on occasion I can smell a hint of chlorine. Is it possible I had bad reagents in my test kit?

Thank you for the help!
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,340
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
A loss of 2-4 ppm FC per day is average. Some higher, some lower.

Liquid chlorine needs to be added EVERY DAY during swim season.

Do an Overnight Chlorine Loss Test. CC is one indicator. Not a defining indicator.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,340
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I shouldn't be concerned that my CC has never been higher than 0?
No. That is good. It is one indicator of an algae free, healthy pool system. There are two more (pass OCLT and crystal clear water).
 
  • Like
Reactions: demedeirosa
Thread Status
Hello , This is an inactive thread. Any new postings here are unlikely to be seen or responded to by other members. You will get much more visibility by Starting A New Thread