Sorry if this has been asked before, I'm new to this forum. I have a solar pool heater with what appears to be the standard bypass/diverter valve and isolation valves (in and out). The previous owner of the house did not provide me with the owner's manual for the heater. I was wondering what's the difference between the bypass/diverter valve and the isolation valves? Seems like if the bypass/diverter valve is in the position to bypass the solar heater, then it doesn't matter what position the isolation valves are in, the water would just flow directly to the pool. Seems like the two serve the same purpose. Can someone explain when you would use one vs the other?