Important Note: Make sure the hose is not kinked or kinked which could prevent water flow. Make sure the base of the unit is centered in the pool. The base of the unit should be placed away from leaves and/or debris; which can block or slow drainage. Water will not flow uphill. The end of the pipe and the siphon pump must be less than one; when working to initiate/create siphon action. Main Unit: Filling the hose with water before using the siphon pump will help the siphon action start easier and faster. Simple Design: Pool Cover Siphon Pump - This simple device pumps water from your above-ground tarp without electricity. The pressure pump starts the flow of water and stops automatically when the lid is empty. Unit comes complete with drain, pump and siphon and 15ft of hose. Features: Why do you need a pool cover drain pump? - Your winter pool cover keeps rain, sleet, and debris like leaves and twigs out of your pool when closed. Plus it's used regularly in the off season, a pump means less cleaning when you open your pool. And that means you'll be able to get back to the fun much sooner. How it works: This pool drainer has a hand pressure pump that you attach to the end of the hose and it has a passage for water so you don't have to remove the pump if you don't want it. Prevents water and small debris from building up on the cover by pumping it out and into the yard, or wherever you direct it. Save Time and Money: adding a pool cover pump to your maintenance can save you a lot of energy, money and time. Not to mention the peace of mind that you'll know your pool and winter cover are protected during harsh weather months.