The floor surface is occasionally constructed entirely with sand, but this limits the use of the facility. More commonly the floor consists of a 5- or 6-in. cement pad reinforced with Rebar.
The brine is supplied to the floor via 6- to 10-in. headers. The headers are constructed of PVC or steel. The headers feed an in-floor-cooling grid consisting of 1-in. polyethylene or steel pipe spaced on 3- to 4-in. centers.