CYA- Chlorine balancing help please!

[Kmeans]

This crazy rain we are having is messing up my pool levels! I have the Taylor 2006 test kit-

Tested cya myself and could still see the dot at 30, so took to pool store for a test-

Chlorine level -8
CYA- 20
pH 7.6

I added one gallon of Liquid CYA. I’d like to SLAM my pool to being to shock level tonight if possible.

How quickly after adding liquid CYA can we test for accurate levels? I’m anticipating the gallon to raise it to about 45.

If my SLAM is 16, how many gallons of chlorine would you add?
How long after adding the cya do I need to wait before shocking?

My kids have hardly used the pool and we are hoping to swim tmrw- so don’t want to add too much chlorine!

Thanks

 

[kimkats]

Since you know how much CYA you added start with a CYA of 20 then put in what you added to get the total amount.

Here is the pool math that does all of the math work for you:
PoolMath

 

[Kmeans]

Since you know how much CYA you added start with a CYA of 20 then put in what you added to get the total amount.

Here is the pool math that does all of the math work for you:
PoolMath

Perfect thanks! Based on what I added- CYA will be 41

 

[cdadams1223]

Perfect thanks! Based on what I added- CYA will be 41

CYA is on a logarithmic scale. It’s never 41, 45, etc. It’s either 40 or 50. Always round up.

 

[Bperry]

Perfect thanks! Based on what I added- CYA will be 41

If the CYA is 40 you can swim with the FC all the way up to 16ppm.