The Flowclear Pool Floor Protector consists of nine sheets of durable polyethylene, which can be arranged under an above ground pool to protect the base from wear and tear caused by pebbly turf, pointy twigs and other ground debris. The ground sheets are simply placed on the spot you plan to set up your pool. The sheets have been specially designed to lock together for extra stability and simple expansion. If the nine sheets aren't enough to fit the size of your pool, you can buy extra packs and expand the area that the pool flooring covers. One of the benefits of the hardwearing floor sheets is that they offer fantastic protection for your lawn. If water spills over the edge of the pool, it simply accumulates on the surface, saving you from sinking knee deep in sludge when you exit your pool.