My indoor vinyl pool has very high CYA levels -- should I drain it?

[BigDave]

Any kind of chlorine will add to the FC when you put it in the pool.
Sunlight is one of the things that help clear CC. Maybe a UV system might be useful in your pool. We usually tell people to avoid or shut them off on their outdoor pools but if your pool gets no sun...

[swimnfun]

I don't know if this makes a difference but the building is "see through" and has doors that open at the side. We have had little sun here in North Idaho so have had the building closed. It is suppose to get up to hundred this week so I will open up the building with hopes the sun will burn up some of the chlorine. For now I will not empty and see what happens. Maybe this is why I have had problems as it has been cold and wet this year more than usual and the building has been closed? Who knows. I scratch my head daily wondering what went wrong. There has also been work done on the well system over the past year in the neighborhood and anything can be added for all I know. We have a water filter on the system to help get rid of contaminates. It has helped some with the TA.

[BigDave]

Does the sun shine on the pool water when the building's open?
I have to tell you that very few people on this forum have any experience with indoor pools and I'm not one of them.

[Watermom]

I'm going to ask Ben to look at this thread.

[swimnfun]

I have gone ahead and emptied part of the pool and am refilling. We cleaned out the sand filter by washing it thoroughly with water to hopefully get rid of some of the stabilizer. It was pretty murky white. I have tested chlorine levels at the halfway point of refill and the total chlorine is now 15.0. I will test everything once pool is full. I have had the doors open with sun hitting it this afternoon and hope that will deplete some of the chlorine as well. I hope this takes my CYA levels down to a more manageable level for balancing chlorine and not having to supershock at such high levels. Wow! With all the researching I have done I feel I could have a chemistry degree . Sure appreciate all the information here. I guess after 21 years of pool ownership and no major problems I feel pretty good. I have been thoroughly educated and an education is worth much to me whether it be in pool maintenance or??? I guess I will need to read up on winterizing as we always floated pucks in the water and me thinks this is how the CYA increase happened. Thanks