James...something more durable underwater would be better...like a plastic floor pan, 3'x3'..also raise your diffusers 10-20 inches off the base. Diffuser units without a wide, flat base often sink into the substrate over time.
Rubber truck mud flaps are great also, if you frame them...Cheap in almost any auto parts store....they come in 18"x24"...24x30 and 30x36...about $8-$18ea
Last edited by Rainman; 01/10/14 02:24 PM.
