Is my FC level too low given my stabilizer level is 100?

[qiuhuanihao]

Hi,

I have a 25,000 gallon Chlorine pool. i tested pool water and here is the result.

Here is the result.

Is my FC level too low? what is the ideal level of FC given stabilizer level is 100 now?
How much pound of Chlorine should I put to bring FC to the ideal level?

 

[Richard320]

If (Big if) those pool store results are correct, then yes, your FC is way too low. See FC/CYA Levels

Also worth reading ABCs of Pool Water Chemistry and Test Kits Compared

 

[Jimrahbe]

Q,

"If" your CYA is actually 100, and I suspect it is much higher, then you just need to drain at least half of your pool and refill it..

You need to get your CYA down to 50 or less..

Thanks,

Jim R.

 

[Divin Dave]

The FC/CYA TFP recommendation of chlorine to CYA is 7.5% on the low side and 11.5% on the high side.

In a scenario, lets just say your CYA is actually 100, and your FC is lets say 10% , then your FC would be 10 which would be OK per the math.
However, it would take a lot of liquid chlorine to maintain FC of 10. Its really not practical or economical to do that.

And also, lets not forget that when FC reaches 10 or higher, then the pH test becomes invalid.

Hi,

I have a 25,000 gallon Chlorine pool. i tested pool water and here is the result.

Here is the result.

Is my FC level too low? what is the ideal level of FC given stabilizer level is 100 now?
How much pound of Chlorine should I put to bring FC to the ideal level?

 

[qiuhuanihao]

Thanks for all replies. It seems to me that I need to lower CYA level. Other than draining the pool, what other options I have?
How to drain the pool? I have never done this before.

 

[Jimrahbe]

Q,

There is no other way...

You can rent or buy a sump pump...

You can use a garden hose and set up a siphon, so that water flows downhill through the hose.

Thanks,

Jim R.

 

[Hootz]

If you have a sand filter and main drain you can use your pool pump (pump to waste).

 

[mknauss]

We need to know what type of pool you have. Please fill out your signature.
Read Draining - Further Reading for details on draining/exchanging your water.

 

[Richard320]

I wo

Thanks for all replies. It seems to me that I need to lower CYA level. Other than draining the pool, what other options I have?
How to drain the pool? I have never done this before.

I wouldn't drain any based only on pool store testing. While it's likely to be much higher than 100, it could just as easily be 70. Without knowing how high the CYA is, you don't know how much to replace.