Hi Waste! Wow, we feel much better. Thank you. We do not know about our fill water. We actually filled w/ city water , but our normal fills - topping off - we do with our well water. I can take a sample of each to the pool store for metals testing? Or, should I just take a sample of the pool water? btw, can you calculate how much bleach to add to maintain a 1 to 1.5 cl? I read somewhere here to keep it low for the first month - also, the plaster will be 3 weeks old tomorrow (not 2wks old) Thanks again.