Don't fill it completely, just halfway so it doesn
[This review was collected as part of a promotion.] The Swimline ACC22 2 x 2 Foot Corner Water Tube va Very good, does its job and keeps the cover secure during the winter. Material: Strong and durable vinyl, with sealed seams that prevent leaks. Safety: Fits snugly in the corners and prevents the cover from shifting or debris from falling into the water. Recommendation: Good option for keeping the pool protected during the cold season.