Cyanuric Acid

[Sue225]

Thank you all for your help. I am waiting for chlorine to drop to about 8-10 before I let grandkids swim. I have owned this pool for 23 summers and I never, ever had anyting like this happen before. Grateful you were here to help!
Aylad I have already drained 1/2 of the pool about 1 week ago!
It has been in the low eighties and high ninties here with a few storms. Can you make a guess as to when my chlorine will drop to around 10?
Have a blessed day!

[aylad]

Aylad I have already drained 1/2 of the pool about 1 week ago!

I know that you drained a good bit--but the CYA numbers that you've posted are still very high. So you'll either need to drain/refill some more in order to lower it, OR keep your chlorine levels high (8-15) in order to compensate for it. Which decision to make is yours--I don't know how feasible they are to you.

Can you make a guess as to when my chlorine will drop to around 10?

I would say by late today or tomorrow. It doesn't take long after a rainstorm!

Janet

[Sue225]

If you have cc does that mean something is trying to bloom? My FC is now down to 11 and cc is .5 We had bad storms yesterday and I have not had a chance to vacuum bottom of pool. Do you think that is why my cc went up to .5 from 0?
Thanks for all your help. I have learned so much about pool chemistry!!!

[Watermom]

The rain probably dropped some debris in the pool which can cause a little CC. As long as you are no higher than 0.5 you are ok. Or, you can go ahead and shock the pool and that will take care of it.

[Sue225]

CC was o this AM!!! My test vial was dirty. Washed and dried it and cc was perfect!

Question is my fc is now 8 i do not want it to go lower. How much chlorine should i add tonight to get it up to 11 since i am losing about 3 ppm each day with this heat and sun.
thanks in advance

[Watermom]

In your pool, each quart of 6% bleach should add approximately 1ppm of chlorine. So that makes it easy to know how much to add --- 3 quarts.

[StevenB92]

I slightly remember years ago I read somewhere that if the pool is calm for a while that the CYA will "float" to the top and then you can remove that water, e.g. via the skimmer, thus removing a higher concentration of CYA. Also I believe that the article/post/whatever it was suggested siphoning off the top while having a water hose in the bottom of the pool slowly adding water and "pushing" the higher concentration CYA water towards the siphon.

About a year ago a co-worker told me a pool store guy verified the idea that the CYA will stratify in a calm pool and that to remove the most CYA let the pool settle and then remove the water from the top.

I have been meaning to test my water with the pump running for the "normal" cya level and then after letting the pool sit overnight test the water from a couple inches and then a couple of feet down to see if there is any difference.

Anybody else hear anything similar to this?