Basement floor replacement under fresh water tank

We have been using a product from GE Poly they call "puckboard" intended for lining hockey rinks(the boards) Comes in 4'x8'x1/4" sheets at about $100 each, and appears to be HDPE. Comes in yellow, white. blue, black, and a few other colors. Tough, handles 100 mph hits from hockey pucks and hits from skates and sticks. We have used it for signs that have been up on telephone poles in all weather for ten years now and still look new. It's what I'd use anywhere wood might delam or rot.