Free And Total Chlorine Question

[styro]

Hi,

For a past 4 months I apply the bleach method in my spa.

The water chemistry was good and stable.

My PH best stability number was set at 7.7 with TA at around 45-49.

Last week I was behind with adding chlorine one day.

The Chlorine level drop to around 0.

Now after a week I've notice my Free And Total Chlorine are out of balance.

My numbers are :

F.ch 2.99

T.ch 3.99

PH 78

TA 63

My concern is F.ch and T.ch

What should I do in the case like this when the difference is 1.0 between this 2 numbers.(or even smaller#)

My first though is to super chlorinate up to 10ppm.

Can you please give me some advise.

Thanks

Adam

[bart6453]

Hi,

For a past 4 months I apply the bleach method in my spa.

The water chemistry was good and stable.

My PH best stability number was set at 7.7 with TA at around 45-49.

Last week I was behind with adding chlorine one day.

The Chlorine level drop to around 0.

Now after a week I've notice my Free And Total Chlorine are out of balance.

My numbers are :

F.ch 2.99

T.ch 3.99

PH 78

TA 63

My concern is F.ch and T.ch

What should I do in the case like this when the difference is 1.0 between this 2 numbers.(or even smaller#)

My first though is to super chlorinate up to 10ppm.

Can you please give me some advise.

Thanks

Adam

All you have going on is a bit of unoxidized waste. Typically at the point where you are at is when people shock it or "super chlorinate" Use the pool calculator to determine what level to shock your tub at with chlorine based on your current CYA level. Another alternative is to keep some MPS around and add that when your combined chlorine reaches or exceeds .5ppm. (this is what I do as I don't like to close my tub for a day while the FC level drops)

You will also notice higher CC after heavy bather loads.

FYI: The difference between FC and TC is Combined Chlorine....I am sure you already knew that but just thought it prudent to put it in the post.