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Thanks so much for your responses, both of you. I have no idea whether there are metals in the water, but I know we have lots of calcium, but guess I'll have to use a little chlorine after all it seems. No, it doesn't have a 24/7 circulating pump, but we were told we could program it to circulate several times a day. I plan on using the N2 catridge to boost it, if that makes any sense.This is a Resort 856 spa made by Artesian. It has 3 pumps, 92x92x38. I was wondering about how full to fill it since we will have our family here and we'll have four in it at once. Do the upper row of jets have to be covered with water? Seems like with four people the water level would go up..Thanks, Ramsey