Adding CYA, all at once or in 2 steps?

[IsaacFL]

I just drained and refilled my pool to fix high CH problem. When I refilled the pool I checked water meter at start and finish, so know the volume.

According to PoolMath, to get CYA to 70 for my SWG pool I should add 3 lbs, 14 oz.

I added the first 3 lbs via sock in front of return method yesterday, which should take it to 54.

My question is, do I need to wait a week, test the results, and then add the remaining CYA?

Or can I just add the remaining 14 oz today (while monitoring pH) and trust PoolMath that it will go to the right amount?

Don't want to get my CYA too high, but I trust my ability to weigh the CYA more than my eyes to read the results of the test.

Thanks,

 

[jblizzle]

How much water did you replace? How sure are you of the volume of the pool?

I think I would wait a week, retest and then add more.

 

[IsaacFL]

I drained it completely so I replaced all of the water.

I am pretty sure of the volume since I used the water meter at the street at start and finish of refill.

 

[jblizzle]

Well, then PoolMath should give you the right amount to add ... it is not like going a little over 70ppm is a big deal anyway.

 

[IsaacFL]

The other thing, is according to this post:
http://www.troublefreepool.com/threads/24188-Extended-Test-Kit-Directions?p=203524&viewfull=1#post203524

The accuracy of the test, is plus or minus 15. So if my first addition takes me to 55, the test results could give me 40 to 70.

So I figured it would be more accurate knowing the volume, to just trust PoolMath.