Thanks again for all your help last time around.
The pool is now up to snuff (still stuck with 90 CYA though):
CH 450 (well water)
CYA 90 (ignorance)
It is crystal clear and easy to maintain using BBB!
My question is: when is it necessary to add "suncoast ultimate metal control"?
I was looking through my records and remembered the pool store wanted me to use a $20 bottle every month.
I could not find any info using 'search', but really didn't know what I was looking for.