I am sure someone has already done this, but it is a first for me. I hate having to buy pool water bags every year because they break and tear so easily. This year I am trying something new. In my house we go though gallons of milk and water constantly. I just started saving the containers, filled them with water, and tied them together. I would tie four together and place every so many feet apart. This is the first year for me so not sure how they will fare through the winter. It also doesn't give a completely tight seal, but I am more concerned with protecting the liner than keeping dirt out. Just thought I would share.
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