Is my FC consumption reasonable?

[Water_man]

The FC in the chart is the level before the treatment.
I haven't measured the FC immediately after the treatment because it takes time for the water to circulate and to evenly distribute the added FC.

[aylad]

I haven't measured the FC immediately after the treatment because it takes time for the water to circulate and to evenly distribute the added FC.

Yeah, I get that.. But my point was that there's no way to determine how much chlorine loss you have without knowing the peak to begin with. You can get a good idea of the peak, assuming no algae problems, by adding your chlorine in the evening and then measuring early in the day before the sun hits the pool. Or add it, let it circulate for a couple of hours, then test....it'll give you at least a ballpark.

Janet

[Water_man]

Yeah, I get that.. But my point was that there's no way to determine how much chlorine loss you have without knowing the peak to begin with. You can get a good idea of the peak, assuming no algae problems, by adding your chlorine in the evening and then measuring early in the day before the sun hits the pool. Or add it, let it circulate for a couple of hours, then test....it'll give you at least a ballpark.

Janet

OK. Already got yesterday's late PM reading. Added chlorine last night (shooting for FC 6.8 as per chem geek's chart) and measured this moring (pump worked non-stop.) Will measure again at eve and will post all numbers. Thanks

[Water_man]

OK. Already got yesterday's late PM reading. Added chlorine last night (shooting for FC 6.8 as per chem geek's chart) and measured this moring (pump worked non-stop.) Will measure again at eve and will post all numbers. Thanks

Alright, Janet, I have the numbers.
On Thursday, 5/29 at 4:30 pm I had FC 4.5.
I added chlorine at night time an amount calculated to reach 6.8.
After all night of ciruclation, today's 8 AM reading was 6. Today's 7 PM reading was 4.5.
Again, CC has always been <0.5 , although non-zero.
Does it make sense that with CYA 60 I lose 1.5 ppm a day for UV degradation?
Is it possible that FC is consumed by the polyquat?

[Watermom]

Does it make sense that with CYA 60 I lose 1.5 ppm a day for UV degradation?

Yes, even with cya in your pool, you will still lose chlorine especially on hot, sunny days.

[aylad]

Yes, it makes sense...in fact, I'm surprised it's not a little higher than that. If you want to try to reduce the loss, you could try to up your CYA just a little and see if it makes a difference, but honestly 1.5 ppm daily isn't a bad number at all.

Janet

[Water_man]

Yes, it makes sense...in fact, I'm surprised it's not a little higher than that. If you want to try to reduce the loss, you could try to up your CYA just a little and see if it makes a difference, but honestly 1.5 ppm daily isn't a bad number at all.

Janet

Thank you aylad and watermom for your responses.
I've been adding bleach on a daily basis now, in order to maintain the 4-6.8 ppm FC as per the table (CYA=60.)
Since it is recommended to add chlorine at night, does it make sense to keep the pump working 24/7?
I wonder what everybody else is doing.

[aylad]

I only run my pump 9-12 hours a day during swimming season (turn it on when I get up, off when I go to bed, except when the water gets too hot, then I do it opposite). My pump time decreases to a couple hours a day during the winter.

If you're not using a SWG or trying to clear up an algae bloom, I don't think 24/7 is necessary.

Janet