CYA Through the roof?

[Watermom]

If it were my pool, I would drain half the water and that would take the cya to 50 which would be a good number. The other comment I have is that ph of 6.8 is too low. And, since on most testkits, 6.8 is the lowest reading it will show, it may actually be much lower. Any reading below 7.0 is acidic and will damage your pool. Get some Borax in there and raise it up to around 7.4-7.6. Welcome to the forum. Let us know if we can help more. We're here!

Edit to add- Have you used trichlor tablets as your source of chlorine? If so, that is where your cya came from. Those tabs are stabilized which means they have cyanuric acid in them. Also, upon rereading your post more carefully, I see where you say you don't really know what your cya reading is. So, draining half may or may not take it to 50. You may need to do a couple of partial drains if the first one doesn't take the cya low enough. Do NOT, however, drain your whole pool at once or you risk floating it out of the ground or ruining a liner if it is a liner pool. The other option is to keep the high cya and just run higher than normal chlorine readings. But, like I said, if it was my pool, I'd do some partial drains and get that cya number down. Hope this helps.