Hi Jason
I use to use a gravity feed from my overflow. I was continually having to clear the line as little snails would find their way in the 1/4" line and plug it. This would happen about every 2 weeks or so.
I now use a MJ 600 out of my sump to supply the reactor with an air valve to control the flow of the effluent. No more snail problems (at least with my calcium reactor).
Tom R
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