I'm starting my new 20l project. Going to build a counter current skimmer that will be in my sump. Can I T off the drain into my skimmer and put a gate valve at the inlet and outlet of the skimmer? I'm trying to eliminate as many pumps as possible so I thought I could use the drain line to put water thru the skimmer. I was also reading that you would need a slow flow thru the skimmer to optimize the process. Am I on the right track?