35ppm is a bit high, but it might come down. Mine comes out at <10 on one unit and ~20 on the other. The left chamber appears to be for DI as a final stage. This, if you put a resin cartridge in it, will bring your TDS to virtually zero. You'll have to change it when spent, otherwise TDS goes back up to RO only range. 35ppm TDS is very clean water. The carbonate removed from the water, if your water is alkaline, will result in a nice acidic permeate. 0ppm water is ultrapure. Some use it straight up with success and others "reconstitute" some stuff that's already in the tap with additives that add back alkalinity, calcium, magnesium ... I just use RO because I use a lot and I'd go through too much resin (I do use RO/DI for drinking water).
That eccentric port on the left side of the RO housing (the white one on top) is the "brine" or "dirty" water. Usually this is hooked up to a flow restrictor (matched for flow rate to your particular RO membrane) and then to the drain. Sometimes an alternate drainage pathway bypassing the flow restrictor is provided as a means to "backflush" or clean the membrane.
I'm not sure what the parallel lines hooked up to the brine port with a closed valve on one side is for on your system. Maybe give the guys at BFS a ring or email. They offer pretty good customer service ...
That eccentric port on the left side of the RO housing (the white one on top) is the "brine" or "dirty" water. Usually this is hooked up to a flow restrictor (matched for flow rate to your particular RO membrane) and then to the drain. Sometimes an alternate drainage pathway bypassing the flow restrictor is provided as a means to "backflush" or clean the membrane.
I'm not sure what the parallel lines hooked up to the brine port with a closed valve on one side is for on your system. Maybe give the guys at BFS a ring or email. They offer pretty good customer service ...
