On the valves - I have pool school at the end of the week - DH just called and said that they were out and the spa has water now. I guess I will read those manuals and then see what they tell me on Friday.

Another stupid question - what is supply-side? I have also read "suction side" - is there a place I can get definitions for these terms. I totally understand all the chemical stuff - but the plumbing seems like a totally different world to me