CYA Through the roof?

[Watermom]

Good. Keep us posted. And .... then -- no more trichlor. Trichlor does have its place in pool care. If it is a fresh fill where you know there is no cya, you can use trichlor to add chlorine and cya at the same time, but you have to monitor the cya level as it builds up. Once you hit somewhere between 30-50 cya (I like around 40), you have to discontinue the trichlor.

Did you look at the ingredients of your 'shock'?

[Poconos]

Swilson, what is your water supply? Reason I ask is if it is city water you may have a bill through the roof. You may want to consider using a large plastic sheet instead of just draining-refilling-circulating etc. You can get a large plastic sheet and lay that on the pool. Fill on one side and drain off the other. The membrane keeps the new and old water separated and theoretically you can do a complete exchange without dropping the water level and risking damage to the liner if that's what you have. Sounds like you have a relatively large pool so I don't know if you would have to stick a couple sheets together to get the size. How you would do that I'm not sure. Duct tape may work for a while but maybe there is some kind of adhesive or solvent that would work and hold for the time needed.
Just some thoughts that have been proposed before.
Al