Find a food grade hose rated for 600 psi +. The pressure in an RO is pulsating not static, that complicates the issue. The only places needing the real HP hoses are between the HP pump and the membranes, then to the needle valve. After and before those you can use much lower pressure components.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.
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