My FC did drop

imcj

Well-known member
May 18, 2010
182
5/30
FC 13
CC .5
TC 13.5
TA 170

After changing the SWG from 3 hours to 2 hours last night, today the results were
FC 8
CC .5
TC 8.5
TA 150
pH same - between 7.2 and 7.5 but the color is much closer to 7.5

FC dropped significantly by dropping the hour on SWG didn't it? I still need it to get to 5 though. I hope it doesn't keep dropping that quickly or I'll be in trouble. I'll just wait and see when I test tomorrow before panicking.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
When adjusting the SWG run time, it is best to test the FC level in the early evening. That is when FC is the lowest, which is what matters.
 

imcj

Well-known member
May 18, 2010
182
Thank you. I guess I missed that. I will retest this evening. Should I just test everything in the evening or do some tests need to be done in the morning? Thank you for your insight.
 

PaulR

LifeTime Supporter
Jan 11, 2009
1,966
Cupertino, CA
Most people find it convenient to test whatever they need to test all at the same time.

Do you run the SWG at night, or during the day? If you run it during the day, then FC will be lowest just before it comes on, and that would be the time to test FC. Otherwise evening after the sun is off the pool (and before the SWG comes on) is best.
--paulr
 

imcj

Well-known member
May 18, 2010
182
Thank you very much. The SWG comes on at 9 pm. I live in So CA and in one of those areas where we hit 115-120 in our hottest time in August so I don't run anything if possible during the day except A/C. Maybe it would be best to test about 7:30 while I still have light but before SWG comes on. Thank you.
 

PaulR

LifeTime Supporter
Jan 11, 2009
1,966
Cupertino, CA
imcj said:
Maybe it would be best to test about 7:30 while I still have light but before SWG comes on.
:goodjob: My only caution is if you need to test CYA, that should be done with your back to full sun to get the right light level. Otherwise you should be fine.
--paulr