I will be putting up a new 16 foot 52 inch above gound pool next month at our new house. I was pondering the idea of putting the black landscaping fabric down under the pool before we lay down the sand to keep weeds and grass from growing up through the liner. I would like to use the black fabric that will allow water to drain through but will prohibit vegetation from growing through. It this a good or bad idea. Let me know your thoughts.