I am not a pool professional although I do a lot of the care for my inground spa. It is about 1100 gallons and has an integrated water fall feature. It is a salt system spa with Pentair equipment. I am trying to figure out how to handle the winter weather. We have had early freezing temps beginning last night here in colorado. As I was not sure what to do and it was a weekend(no spa guys in CO work on the weekend), I just turned left the spa and water feature turned on continuously for now--and will suck up the utility bills. There are separate pumps for the water feature and the spa as far as I can tell. The spa has two pumps--one for normal use and a second "super pump" for when we want more forceful therapeutic effect. We definitely want to use the spa all winter long. I am trying to figure out if I need to turn off the water feature and the "super pump" and winterize them- as well as how to handle the rest for all-winter use. The company that built the spa has been totally non-responsive since they got paid.
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If you feel like all of the water did not exit the water feature line you may need to blow it. Remove both plugs. From what you are describing it sounds like a small set up so the water should drain out. If you are not going to run the booster pump you can winterize that one as well and just run your spa with the main pump all Winter.