The owner of 5400 tap operation we worked for in Byron had 2 CDL 600 RO's. He was always around so keeping up with sap was not an issue. He did add a 3rd tower to concentrate to higher brix. Not sure of his settings but he was getting 19 brix in 1 pass with 3 towers. The other RO was just a spare. He bought it used for a decent price and it saved his butt more than once when one of the pumps went and another time when the turbo went. I am not sure why he went with a tower vs. having 2 in tandem but I will ask him. Probably the plumbing work and RO room size was part of it.
305 taps on 2 Shurflo's, 31 taps on 3/16" and 229 taps on gravity. 565 in all
Mountain Maple S3 controller for 145 of the vacuum taps
2x6 Darveau Mystique Oil Fired Evaporator w/ Smoky Lake Simplicity Auto Draw
Wesfab 7” filter press