I have one on my closed loop with an Ampmaster pump. It is a big unit once all the plumbing is tied in as mr alberta stated. If you use a short legth of spaflex pvc from each outlet, it is way easier to get everything lined up. You will need to have a good amount of room to accommodate the setup. Once the plubing is done, the unit works great without any fuss. I am waiting for a set of the Revolution nozzles (on backorder) to compliment the 4-way. Should really mix up the water movement then.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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