These are made from sheets of vinyl. The vinyl is slit and then sealed on all four ends. They are generally 2กฏ wide and may be 8กฏ or 10กฏ in length. They may be made from 10 mil, 15 mil, 20 mil or even 30 mil. Vinyl. There is a vinyl fill valve inserted in each bag to allow them to be filled with a garden hose.
Once these water bags are filled, they are placed along the edge of the winter cover on in-ground pools to hold the cover in place.
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