I bought a new (for me) house with an inground plaster sided pool and spa of about 12,000 gallons. I've never owned a pool, although spent much of my youth in them, so I am excited about having one of my own. I plan on draining and refilling the pool due to CYA at about 350. Just before doing this, I plan on cleaning the DE filters.
I saw a website that suggested cleaning calcium deposits at the edge of the pool with CLR or Lime Away. Is this recommended? I wouldn't want to do anything that might eat away the plaster.
I also have five brown stains at the bottom of the pool which did not respond to trichlor tabs being rubbed on them, so it appears to be metal. Should I try to treat them with ascorbic acid while the pool still has water, or attack them while empty with some other method? I didn't see anything on how to treat stains on an empty pool.
I would be interested in any other suggestions on what to do while draining and refilling the pool. I am trying to do this right the first time if possible.