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Originally Posted by sphelps
Yes very good but that's over 8 feet of head pressure, it's significant but its a pressure rated pump so flow losses are minimal with added pressure. How much power is that using? Around 300W, ouch! not something I would want to run. And exactly who can plumb a closed loop with such little fittings? Take the same case but more realistic and add 3 more elbows, 4 more ball valves, 6 unions, over 4 exists and you'll see that jump up to 13 feet. Then compare that to a more common pump like a dart and you'll get just over 10 feet which drops the flow from 3600 to 1200. You did state that friction exists but it was small, this simply isn't true and there would be a huge difference in plumbing to the basement, add 20 more feet of pipe and pressure jumps to 16.5 feet on the blueline. And none of that even considers what that OM does for head loss, I wouldn't even want to know.
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This is why your use of a Dart was foolish, but you know that now. The total flow loss with a pressure pump is far less than a Red Dragon return pump with only 5' of head.
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You're obviously not too familiar with what my profilux controller can do with my Tunzes, way beyond side to side movement and simple pulses. From sine waves to right angle shorts and random % additions plus storm simulations natural wave movements and night modes I'm sorry but it does way more good than a OM. You could do the exact same as an OM with such power heads at that would be the simplest program, but nobody would because the other options are better.
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You need to stop comparing my Vortech comments to your Tunze pumps. I know you have more options than a Vortech with regard to positioning but you are still limited, and as such you cannot do what a closed loop can. If I were to choose an alternative method, I would go with the Vortech, not the Tunze. Yes I am familiar with the Profilux controller coupled with the Tunze pumps. I service two tanks that have that combination.
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Check out that nice picture I already posted, rock covers can hide such power heads just like a closed loop.
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Yes, but they are transient. You still have an electrical cord in salt water and moving parts in your reef. Once you put that faux rock on the powerhead you are losing whatever intake flow dynamics you were hoping for with your Tunze.
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All the external pumps who have recommended are shaft drive, aren't they? I used darts as an example because you mentioned them in a previous post.
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I think you have me confused with the other guy. If I mentioned Sequence pumps it was only because they are commonly used in the hobby, just as I would refer to a maxijet or Magdrive pump even though I don't use them.
Vortech has taken powerheads to a new level. It isn't a new idea by any means. Aquarium pump manufacturers should be ashamed that it took so long to adapt a simple magnet spinner to the tank. They have been around for over 50 years in the scientific community and they were used in Dynaflow filters in the 70's and Marineland filters in the 80's.
It's too bad there have been no major advances in pressure rated chemical pumps in the past 30 years.