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I am using a marathon 1 3/4 hp pump on the procon 330. I have 1 hp supply pump that has a zero head flow rate 800 gph. Following the supply pump curve, at 140 gph it is supplying ~45 psi. I have my...

This looks like a nice build. I have a similar set up with procon 330 gph. I usually run at ~235-240 psi with fairly high recirc (no flow meter on it) and get 8-9 brix out. My flow rates are 1.5-2...

BRL,
ronintank provided a standard diagram for a RO with recirc.
It would be helpful if you posted a diagram of our system. Include the filter location, pumps, each needle valve and the pressure...

I am looking forward to the results also. Video 4 does look like it might be turbulent.
Adding gasses and vacuum definitely complicates things. I am an engineer but not a turbulent fluids expert.
...

Dr. Perkins,

You stated:
2. Arc-Flow Fittings. These fittings have a curved design which is designed to reduce friction and turbulence in fitting junctions. The Arc-Flow design can be...

Neat idea. I took a quick look at your site and I am trying to figure out the 'value added'.
At first, it looked like you are hacking an Acurite 0899 for the data. The one location with any details...

My understanding is that pumping at HP with very low delta P creates less heat, is more efficient and more flow over the membranes than dropping it down in pressure to bring it back up. All of that...

I am looking to upgrade from 2.5x40 to a 4x40 system (homemade). I currently use a needle valve to re-circ to before the HP pump inlet.

I would like to put a high case (working) pressure pump for...