Water passes slowly enough so that the water percolates above the floor to quickly drain away from a small gap around the perimeter. We only use Marine grade stainless steel 316L for our movable pool floors which is an extremely durable and high quality material. The cost of a movable pool floor depends greatly on several factors, such as surface area (m2), add-on options, shape and l... https://www.facebook.com/progorkipoolsystems