I have been researching with earnest several of the flat-panel black poly solar heaters, the 2'x20' and 4'x20' variety, and I see some mention of too much water pressure being a problem. We're about to mate probably a 4'x20' system like the SunGrabber with our new Hayward 50gpm pump and I don't want to blow it out. I guess having a diverter valve that could relieve some of the pressure on the collector is a must. None of these panels' selling information seems to give any information about operating pressures, except the lower-end models that state they are for Intex pumps and nothing else. If no restrictions are listed do I assume they will work with 50gpm? Has anyone else discovered the hard way it's important to have this information ahead of time?