FC daily lost ?

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L

locky

0
Dec 4, 2016
56
san jose / ca
Here is my pool was on 05/15

FC = 6.5
CC = 0
PH = 7.3
TA = 70 ( aeration from 150)
CH = 300
CYA = 85
Salt = 3800
temp = 68 F

Last 3 days, FC droped to 4.0 (SWG 100% 5 hours/day). so I wanted to raise FC = 6.0 or above, SWG ran 100% 10 hours /day).
Noticed for last couple days my FC still at 4.0 ppm.
Today my pool:
FC = 4.0
cc = 0
PH = 7.8
TA = 120
CH = 300
CYA = 60
Salt = 3200
Temp = 70 F

from 5/15 to 5/30 I filled water 2 times, and each time for 1/2" & 20 oz acid mutaric (14.5%).
Questions:
1. looked like FC lost is 6 ppm , too high ?(is it possible for north California with average temp 70 F ( only 1 or 2 today 80F to 90 F)
2. CYA dropped 90 to 60 ?
3. TA increased from 70 to 120 ?

Thanks in advance.
 
How are you testing? -- Sorry - saw the TF100.

The CYA will not drop that much unless you drained a significant amount of water.
The TA will not increase that much unless you added baking soda (alot) or drained and add higher TA water.
 
Last edited:
mknauss said:
How are you testing? -- Sorry - saw the TF100.

The CYA will not drop that much unless you drained a significant amount of water.
The TA will not increase that much unless you added baking soda (alot) or drained and add higher TA water.
Click to expand...

I did not drain water or add any baking soda. Liked I said I did fill water 2 times due to vaboration and polaris tail rubber stuck on the pool steps (( possible). Beside CYA& TA problems , is it poosible FC lost is too high in my area ? What are recomments I should do to my pool ?
 
domct203 said:
Can the pool pass an Overnight Chlorine Loss Test (with the SWG off and pump running)?
Click to expand...

I have not do any OCLT, my pool was just replastered 7 months ago. Before from beginning of this month, my daily fc lost was stable at 2 ppm ( cya = 90). Lately I just noticed even swg ran 10 hours a day with 100% but fc only maintain at 4 ppm. The I found out my cya was dropped to 60. So should I need to do OCLT ?
 
Doing the OCLT will at least tell you if you have organics in the water eating your FC. Just one more tool to troubleshoot your problem. It may be time to SLAM if you don’t pass. The earlier you can start the SLAM if needed, then usually it’s shorter the amount of time for your SLAM will last.
 
rmclain73 said:
Doing the OCLT will at least tell you if you have organics in the water eating your FC. Just one more tool to troubleshoot your problem. It may be time to SLAM if you don’t pass. The earlier you can start the SLAM if needed, then usually it’s shorter the amount of time for your SLAM will last.
Click to expand...

Exactly.

There are three main culprits to a ‘sudden’ high FC demand. UV from the sun, biological / organic growth, and bather waste. The OCLT can generally rule out UV and bather waste, leaving algae and or bacteria as the primary suspect.
 
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