I like #3
I sold both my 2 Mak4,s and my 3MD pumps. Just like #3, thats how I paid for my Tunze streams.
Thats all that run in my tank. No closed loops anymore. No return pumps. Just the surge from the scrubber, but its only about a gallon dump, every 40 sec.
I do have a Mak4, driving my beckett. But it takes from one overflow and returns to the other, so not much current developed from it.
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Doug
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