Wow 15x, yikes. I am in the process of building an above ground pong in my garage that will net about 5700 gallons and was planning on a 7200 gph pump for the wet/dry, a 4800gph for the 240w UV and a 1200gph for the Aquatic-Eco fludized bed. If my mat is right, that is still below 3x. Is this not enough?