I have a Coleman 8' dual lounger. It's never been filled with water other than the factory test.
Is it safe to use anti-feeze in spas?
Ingredients: Proplyene glycol, ethyl alcohol 64-17-5 and dipotassium phosphate inhibitor.
I asked the company what should be done to winterize and they said.
Pull the drain plug port [a flexible hose that drains the tub located in the cabinet] (did that, it still left some water in the base of the tub)
pulled the drain plug on the motor in the cabinet (didn't get any water out, but there are 2 other motors no located in this area, and my wife wasn't too happy with me suggesting cutting open insulation to get at them.)
Suck all the ports in the tub with a shop vac ( i'm doing that today)
I asked about anti-freeze and at first the lady didn't understand what I was talking about and then said I couldn't use it because it was for pools.
What do you think? Is there anything in that anti-freeze that can hurt the tub?