HELP WITH VENTURI DESIGN NEEDED FOR POND PUMP

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I have a 600 gallon pond with a Aquascape 4000gph surge submersible pump. Off of this pump I have a 1.5 inch flex
pvc pipe that runs to the bio falls about 20 feet away. I want to install a venturi onto this 1.5 inch flex pvc line to aid in
the nitrogen process but I am lost as to where/how to build it onto the system? I want to install the venturi inside of the skimmer box where I have good access to the 1.5 inch flex pvc discharge line. Please see the attached photo. Thanks!
 

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I thought a Venturi was one of those spray fountains in the center of a big pond? So you can see I'll be no help whatsoever!
 
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The problem is that my plumbing threads on to the bottom of the biofalls and there is no room to add anymore plumbing on the inside of the biofalls container. Is there pressure issues if i add it right after the pump?
 

DrCase

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you could cap the low inlet to the falls and come over the top and turn down.
Drill a hole in the 90 and stick a pen in it
 
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I have a 600 gallon pond with a Aquascape 4000gph surge submersible pump. Off of this pump I have a 1.5 inch flex
pvc pipe that runs to the bio falls about 20 feet away. I want to install a venturi onto this 1.5 inch flex pvc line to aid in
the nitrogen process but I am lost as to where/how to build it onto the system? I want to install the venturi inside of the skimmer box where I have good access to the 1.5 inch flex pvc discharge line. Please see the attached photo. Thanks!
Search you tube for " Stop using an airstone". This guy shows how to make a pretty good venturi setup.
 

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