We purchased a pool heater with our pool and our electrician made a comment about it lacking a bypass. Is this something we need, and if so why? I will be shocked if the pool store could have sold us something and didn't!! We have not yet used the heater as we are waiting on the city inspector to come out (hopefully tomorrow) and give the green light. Which leads me to my next question...will the heater have any effect on the chemicals in the pool?