# Thread: PoolMath vs Chlorine/CYA Chart

1. ## PoolMath vs Chlorine/CYA Chart

I'm a little confused about the proper FC / CYA levels.

I have a CYA of 30.
PoolMath gives the proper FC range of 2-6 ppm FC
The Chlorine/CYA chart gives Min 2 / Target 4 ppm

I bring my FC to the "proper" level every evening.
Should I top it off at 6 ppm or 4 ppm?

2. ## Re: PoolMath vs Chlorine/CYA Chart

Whatever level you need to ensure it never drops below 2ppm. Depends on your daily chlorine loss.

3. ## Re: PoolMath vs Chlorine/CYA Chart

If you are losing more than 3 or so FC ppm daily, consider increasing your cya level. I'm at 60 CYA 3 hours East of you and still do as an example.

4. ## Re: PoolMath vs Chlorine/CYA Chart

Originally Posted by woodyp
If you are losing more than 3 or so FC ppm daily, consider increasing your cya level. I'm at 60 CYA 3 hours East of you and still do as an example.
I think I'm okay in that regard.
I've been topping out at 6 ppm every evening. I lose 2.5 ppm a day, max.
I started about a week ago topping it at 5. Since then 1.5 - 2 is the most loss I've seen.

5. ## Re: PoolMath vs Chlorine/CYA Chart

In that case aim for 5 so that you have a little bit of wiggle room with your FC.

6. ## Re: PoolMath vs Chlorine/CYA Chart

Originally Posted by Abigail K
In that case aim for 5 so that you have a little bit of wiggle room with your FC.
How do I aim for 5?
Does that mean make 5 my minimum?
Bring it up to 5 every evening?

7. ## Re: PoolMath vs Chlorine/CYA Chart

That means target 5 so it does not drop below the minimum by the next day.

8. ## Re: PoolMath vs Chlorine/CYA Chart

Let me try to nail this down.
"Target" 5?
Lets say that late this evening I test FC and it reads 3.5
Should I add enough bleach to bring that reading up to 5?
My minimum is 2 ppm. CYA is 30.

9. ## Re: PoolMath vs Chlorine/CYA Chart

Yes.

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