It is known that it is preferable for the pool to be open! But what do you do in winter to maintain privacy from the neighbors? A foldable PVC sheet pergola can be closed and opened at the push of a button, providing you with an opening in summer and super easy closure in winter. The drains inside the columns are hidden and cannot be seen, all the water descends to a channel above the columns and from there goes down through the drains inside the columns.