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Nobody seems to want to actually answer your questions. Â I'm not a dealer, but if it was me winterizing a spa, I'd either suck every bit of water out of the plumbing as possible or figure out a way to circulate RV antifreeze into the works. Â Either one would be okay as long as no water was left in the plumbing to freeze.RV antifreeze is very safe, and non toxic. Â So I'd probably remove as much as possible with a wet vac, fill the spa normally, and power up. Â The little left in the lines shouldn't hurt anything, and would likely be totally flushed out at the first water change. Â Not sure if the stuff comes in colorless form- the stuff I use in my boat engine is pink.