FC Loss over 24 hours

[sbhuta]

Hi All,

Is there an average FC loss overnight?

I have removed using tablets/pucks. Hence, I am adding 12-20oz liquid chlorine every day depending on the Pool Math app.

I did the OCLT test and the loss of FC was around 0.2-0.4. The pool looks great. I will run the OCLT test again.

In 24 hours I see a loss of 2-3ppm FC.

Numbers below:

1. FC:- 5.5
2. CC:- 0
3. pH:- 7.4
4. CH:- 80
5. CYA:- 50
6. TA:- 120

Its 100+ degrees

 

[splashpad]

The Overnight Chlorine Loss Test is done by raising FC just after sunset, testing to verify level and rechecking the next morning before sun is on the pool. It's 8-10hrs usually. FC loss is expected during daytime

 

[mknauss]

A loss of 3 ppm or so each day is very good for Phoenix. Maintain your FC in the target range for your CYA and you will have a clear, clean, and sanitary pool.

 

[sbhuta]

I have done the OCLT test and the loss is not significant. I am more concerned when the loss is in 24 hours. If the loss of 2-4ppm is normal than I am good. Thanks

 

[jgofnj]

That's less than 1 gallon (on average) per week. That's nothing.

 

[sbhuta]

Thanks !! All! I am much relieved.

My only concern now is the CH, which is low. I believe I was told to use Cal Hypo or buy CH increased. Any particular brand for each I should buy? Cal Hypo comes in granular form but I have no idea how to sue it.

 

[mknauss]

That is very low CH for Phoenix water. Have you tested your tap water?

If it is really 80 ppm, then raise it to 250 ppm. No higher.

 

[sbhuta]

I did test my tap water and the CH was 10-20.
Cal Hypo or Calcium Increaser.

If its normal to use 3-4 PPM a day, that means I need to put in half a gallon a day. Thats like 3 gallons a week.

how damaging it is to use pucks? Can we just use like a single puck instead of 3 at a time?

 

[mknauss]

Do you have a water softener? That sounds like water from a softener.

Pucks will add CYA. Each puck you add to your pool is 4.6ppm FC and 2.8 ppm CYA. As the CYA rises, the FC needed will rise.

 

[sbhuta]

Just to tie off on the post. I am using half a gallon of chlorine every day. I am assuming its normal based on what I read above.