You could make your system much more compact by mounting the booster pump on the top bracket, toss the two horizontal DI tubes and convert one of the vertical canisters to a real DI filter and I have a question on the permeate pump. Do you have a drinking water type pressure tank in the system somewhere too? If not the permeate pump serves no purpose since they rely solely on the backpressure in a bladder tank to drive the piston which is what saves waste water.
I have my booster pump and power supply mounted next to the membrane on the top bracket and my two dual inline TDS meters are mounted to the front of the bracket so its all nice and compact. http://www.spectrapure.com/manuals/P...DLY/MC-UHE.pdf
I pump treated water into a 23 gallon Rubbermaid recycling can which fits nicely in a corner next to the hot water heater so its out of the way.
lionhead, running mucltiple sediment filters and carbon are often a bad thing and serve no purpose. The problem is every additional filter has an associated pressure or head loss through it so you are in essence starving the membrane of needed pressure. A single high quality sediment filter 1 micron or less and absolte rated instead of nominal rated and a single 0.5 or 0.6 micron 20,000 gallon chlorine guzzler type carbon block will serve you better.