hi this is my first post so take it easy on me, I installed a solar pool heater, but I am confused on where and which way to hook up the feed and return line, I followed the install sheet but everything I see on line has me second guessing the install, I have the feed at the low side and return and the top side, but both on the same side, all I have seen show the feed into bottom and return top opposite side, I have posted a pic with white lines shown how I routed them to under the deck can someone please put this to rest for me, thank you. also where would I install a vacuum breaker, also do I really need one, some site yes and no.thanks again for any help, I really want this to work as best as I can get it.