1. ## We Don't Understand...

We don't understand Suggested FC Levels on the Pool Calculator.

I'm not sure which problem to address first...

our numbers for tonight...FC - 2.5
CC - .5
TC - 3
PH - 7.5
TA - 160
CH - 190
CYA - 40
Temp - 82

We, of course know we have chlorine to add tonight. But should we shock???? And if so, how do we figure out how much chlorine to add?

P.S. We've added 9 oz. of Muriatic Acid for the last two nights. jenn

2. ## Re: We Don't Understand...

Originally Posted by jj
We don't understand Suggested FC Levels on the Pool Calculator.

I'm not sure which problem to address first...

our numbers for tonight...FC - 2.5
CC - .5
TC - 3
PH - 7.5
TA - 160
CH - 190
CYA - 40
Temp - 82

We, of course know we have chlorine to add tonight. But should we shock???? And if so, how do we figure out how much chlorine to add?

P.S. We've added 9 oz. of Muriatic Acid for the last two nights. jenn
Jenn,

I really like chemgeek's 3 criteria he mentions frequently

1. Very Clear Water - Do you have that?
2. CC's of .5 or less - you've got that
3. The ability to hold FC with not more than 1ppm overnight loss - Can you do that?

If you can meet those, there is no need to shock your pool.

Use Jasonlions nice calculator found in any of his posts to calculate how much chlorine you need for your size pool to maintain the FC level around 3-6ppm on a continual basis.

If you find you can't meet all three above, then I would suggest shocking up to 15ppm and, when you meet all three, let the chlorine drift back down to the 3-6ppm maintenance level.

3. Hi,

Well to let us help you further what size pool do you have? gallons? what type of pool? do you use bleach to add chlorine currently? Is your pool cloudy? algae? etc?

The pool calculator will tell you how much chlorine you need to have to raise your FC from what is currently is (2.5) to whatever number you desire. This will give you the amount of 6% bleach to add (6% is the store purchased laundry bleach).

The CYA/FC calculator will give you your shock level for a pool in relation to CYA reading. I have a CYA level of 40 also so my shock level is 16 but higher if you have mustard algae.

Post your pool gallons and other info and I sure someone here will get you right on track.

Ls

4. yeah i can read...lol...a 25 x 54 pool...what are the depths of the pool? That will also help us determine how many gallons.

5. Yes, we held 2.5 overnight.
I just now filled out the sig, hope it is what's needed. Let me know if I'm missing something.

Ls...see we don't know what that means when you say your shock level is 16. It said ours was 15...what the heck does that mean? jenn

6. ## Oh Dave...

I should have said ...'no, we don't have very ckear water. jenn

7. ## Re: Oh Dave...

Originally Posted by jj
I should have said ...'no, we don't have very ckear water. jenn
Then I would shock the pool.

Ls

9. You won't believe this, or maybe you will...the little light bulb that hadn't come on until I read this was...take the recommended target shock level 15 and put it in the goal box on the left hand side to come up with the dang answer on the Calculator!

We would be lost without this forum. My thanks....jenn

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