Remember.....the husband finally...

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mknauss said:
You cannot gain FC over night unless you added it. Up to you but I would suggest doing it again.

You should lower your pH but first the FC must be 10 ppm or lower for the pH test to be valid. So wait until this evening to test the pH and add acid.
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Yeah, I'll do it again.....only correctly this time.
I will test at sundown and if the FC is at 10 ppm or below, I will add acid to lower pH.
Then I will add chlorine if necessary to target FC of 10ppm. Do I have to wait after adding the acid?
This time I will wait an hour to retest FC.
Our water feature goes off at 7 pm. Does it matter when I test, with or without the water feature on?
 
dakemi said:
Yeah, I'll do it again.....only correctly this time.
I will test at sundown and if the FC is at 10 ppm or below, I will add acid to lower pH.
Then I will add chlorine if necessary to target FC of 10ppm. Do I have to wait after adding the acid?
This time I will wait an hour to retest FC.
Our water feature goes off at 7 pm. Does it matter when I test, with or without the water feature on?
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You don’t need to be at exactly 10ppm for the OCLT. Don’t worry about adding more FC at dusk if it’s 8 or 9. Then test again in the morning before sun up.
 
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Make sure the husband and friends exit the pool at least every couple hours and your FC levels may stay higher! :rolleyes:
 
Good morning.
At 8:00pm FC = 10.5
At 5:30 am FC = 9.5

FYI I brought the FC up to 10.5 (and double checked it 30 min later).

I think it might be the sunlight and use that is causing the FC to drop? It went from 11.5 (yesterday morning) to 5.5 at dusk. It was a HOT, SUNNY day from the get go and our pool gets full sun all day long, no trees. Also, husband had 5 big biker friends over, cooling off in the pool after a motorcycle run.
 
A loss of 6 ppm of FC in a day is a lot. However, as I alluded to before, if they are peeing in the pool, then 6 makes sense. Big biker dudes drinking and not exiting the pool leads me this being the issue. Residual FC usage from such an event could cause 1 FC loss overnight. But it's easy to check by examining FC loss on a day where no one uses the pool (if that's possible).

Though a CYA of only 50 in HI seems low. 60 or 70 would allow FC to resist sunlight better. So long as there is no other issue first.
 
bmoreswim said:
A loss of 6 ppm of FC in a day is a lot. However, as I alluded to before, if they are peeing in the pool, then 6 makes sense. Big biker dudes drinking and not exiting the pool leads me this being the issue. Residual FC usage from such an event could cause 1 FC loss overnight. But it's easy to check by examining FC loss on a day where no one uses the pool (if that's possible).

Though a CYA of only 50 in HI seems low. 60 or 70 would allow FC to resist sunlight better. So long as there is no other issue first.
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My husband is in there every day, but somedays its only him, but I don't know because I work and he's retired. Should I do the FAS-DPD test every evening before dusk to see how much FC is lost in the day?
 
dakemi said:
Should I do the FAS-DPD test every evening before dusk to see how much FC is lost in the day?
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Yes. As you will need to add liquid chlorine each evening to replenish the FC back to your Target Range. If you find the FC at or below minimum when you test, add 1 or 2 ppm FC more liquid chlorine above target level.
 
mknauss said:
Yes. As you will need to add liquid chlorine each evening to replenish the FC back to your Target Range. If you find the FC at or below minimum when you test, add 1 or 2 ppm FC more liquid chlorine above target level.
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I'm a little confused with your answer.
Is my Target Range the 10 ppm or the target based on CYA as per FC/CYA Chart (6-8 based on my CYA of 50)?
Is this correct:
Add Muriatic acid now to lower pH
Test at dusk and if FC is at or below minimum (based on above answer) add more liquid chlorine to raise FC 1 or 2 ppm above that minimum level.
 

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As you passed the OCLT, you now follow the FC/CYA Levels

You will add liquid chlorine every day to raise your FC back into the Target Range as shown in the chart. If you find when testing each day that your FC is at or near the minimum FC as shown on the chart, increase the level of FC by 1 or 2 ppm above the target level to see if that manages your additional FC loss each day. Increasing your CYA by 10 ppm may also help your elevated FC consumption.
 
G
mknauss said:
As you passed the OCLT, you now follow the FC/CYA Levels

You will add liquid chlorine every day to raise your FC back into the Target Range as shown in the chart. If you find when testing each day that your FC is at or near the minimum FC as shown on the chart, increase the level of FC by 1 or 2 ppm above the target level to see if that manages your additional FC loss each day. Increasing your CYA by 10 ppm may also help your elevated FC consumption.
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Got it, thank you.
How about the pH?
 
Maintain the pH in the 7's. If your TA is under 100, then only lower pH to 7.6 when it hits 8.

If you would enter your test results into your PoolMath app, it is easier for us to see a history of your test results.
 
If you took the picture with your phone turn off HDR and take the picture again. It should upload then.
 

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