NEW PLAN: Since I'll be fixing this pool for my folks who don't ever want to use it again, I might as well get some enjoyment out of it myself!
They are planning to sell, but not until the end of the year. In the meantime, I could be using it.
The water is GROSS & who knows how old. I think I want to drain it & start again. At least drain the majority of it while I'm waiting for my test kit to show up. Reading through the Draining - Further Reading page, looks like a submersible pump is the way to go?