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 if your looking at used take off a  few  jets they  come out, if the person had bad water  quality the jets will show it-pH, alk  not adjusted right or excessive Chlorine etc.  the inners of the jets will help tell that  (thell look  really worn) and  bad water can  really be hard on plumbing.  definitely get an insulated tub, the other thing  is comfort sit in it make sure it feels good for you.  I got a Coast Spa its a BC  company  and very happy with it.  i heard bad things about COSTCO tubs. 
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 brent
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