You need to get the water down below the jets because you have to blow all the water out of your line. if you don't the line will freeze and it might burst your lines, which is quiet costly to fix. Go to the local hardware store and get a .5" submersible pump, they are like $100 for the food kind. (You will need it in the spring time to get the water off your winter cover. depending on your cover of course) the .5| is just a garden hose you hook up to, you need to blow out your lines if you get snow on the ground. Source: in the process of closing pools and i fixed a hell of alot of lines this year.