David solved his Aquamedic Reactor 500 pressure problem. David, just to end my own confusion [well, on this one item anyway ;-) ] the Reactor 500 *does* use a water flow, right? Is it reverse flow, from the top down, or forward flow? Thanks, Scott H. __________________________________________________ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2