Hello all, new member. Just was given a free hot tub. Opened it up, and I have a few things to fix. When we dry tested the circulation pump, it does not sounds like a nice, smooth pump. Instead, it sounds a bit clunky. My father-in-law says that that might be because it is not supposed to dry run. We're not sure. A new pump is about $150, but I don't want to spend that yet without being sure. This is a 1994 sweetwater. The pump is a Laing SM-909-NHW.
Thank you so much for the help in advance!