Venturi sound coming from overflow, afraid it will damage pump...

[theMeat]

On a single pipe drain water and air goes down the pipe. Cover the hole and it creates a full/closed siphon and the water goes down faster. Make the hole bigger and more air goes down, making it noisier. You could put a small hose into that opening with a valve to find the ‘sweet spot’ for quietest operation. Might be just as quiet as a stockman.

 

[Cristy17]

Great! That sounds doable! I will try it and see. I am a bit disappointed because I figured a stronger return pump would cycle the water more often in the tank but with the noise, I can only run the pump at 33%. I also connected an Apex 1” flow meter and its only reading about 165 gallons an hour..that is much less than the pump can push and although I know the pipe length, head pressure, elbows and tees bring the flow down but that seems like a lot. Oh well, at least its a much quieter pump and easy to control.

 

[theMeat]

Cool beans. Use the valve on airline to open/close/adjust to find that sweet spot. Sometimes the smallest of adjustment makes the difference.
Good idea to loop the end of the hose back down into overflow box, but above the waterline. So that if drain gets slowed by debris, snail, whatever, the water in overflow will rise and the end of hose goes underwater, creating a full siphon, which will make water go down faster, avoiding a flood. A backup if you will, that you wouldn’t otherwise have.
Let us know how it works out

 

[Cristy17]

Cool beans. Use the valve on airline to open/close/adjust to find that sweet spot. Sometimes the smallest of adjustment makes the difference.
Good idea to loop the end of the hose back down into overflow box, but above the waterline. So that if drain gets slowed by debris, snail, whatever, the water in overflow will rise and the end of hose goes underwater, creating a full siphon, which will make water go down faster, avoiding a flood. A backup if you will, that you wouldn’t otherwise have.
Let us know how it works out

Thank you for your input and very well explained instructions! I have some time today and will be working on this. Once completed I will let you know how it works. Thanks again!

 

[Cristy17]

So it turns out, once I turned on the two manifold valves, one for a reactor and the other for the chiller, I was able to raise my return pump speed to 70% which then stopped the whistling! So no modification was necessary. I have the reactor cycling about 50 g, the chiller about 100g, and the DT about 330 g. Its all working well! Thanks everyone for all the suggestions! So nice to have so many brain storming for members!