I have an aquatech 8800 it seems adequate for the task with 2-400gpd membranes. I dont really know the rate I'm getting as the first batch last week was already close to 3.5% and now I'm doing 2.5% and recirculating back into the same tank. In 5 hrs it removed about 17-18 gal of water.
2019- RO
2018- 25 taps made 8 gal syrup.
2017- 25 taps -built a 2x3 flat pan, and a fuel tank arch for it. 335 gal 7.34gal syrup.
2016- 15 taps, 4.3gal syrup boiling on cinderblock arch 3 roasting pans, 1 redneck trash can with a pot, and a turkey fryer.
2015- 4 taps 44 gals of sap made 2.25 gal of lite syrup.