• Fill the water bags half to three quarters full to prevent popping caused by expansion if the water freezes.
• Place the pool water bags around the cover, so even strong wind will not blow it up or let it shift and keep the leaves leaves and debris out of the pool.
• Winter pool cover tubes are made of heavy-duty cold resistant vinyl with no-leak valves designed to keeps the pool water tubes from leaking and tearing throughout winter.
• The wide leak-proof valve is specially designed for easy filling with a garden hose.There are no problems such as caps being stuck, or difficult to open and close.
• If you are not satisfied for any reason, just return for a refund of your purchase price;we promise 24 hours customer support, please feel free to contact us for any product&order problem.