I would not recommend BB filters for reduction. The Pentek BB iron reduction filter is basically a radial flow filter design with some manganese dioxide ore based media instead of GAC. Not very effective for applications like whole house. It can be useful for very small application ie: POU filtration. It has too little media to be effective at flow rates that are common in households and the capacity is very limited. Then again, we sell a ton of these filters to companies that like the high maintenance costs and repeat business that they create. Same for the BB carbon, way to small to be effective for any length of time in a whole house application. These typically can require frequent changeouts costing way too much time and effort to be worth it. The sediment filter would be fine, but with a properly designed backwashing carbon system, these aren't usually needed as the carbon does a decent job filtration. katalox light n better with a rating of 3-5 microns and is self cleaning during the backwash cycle. I would avoid the system you mentioned, if I recall correctly, and it has been a long time since I have seen Rainfresh Café unit, I believe it was a cheap knockoff valve. You may want to ask what media they use. If it is anything other than Katalox Light, I would ask them to upgrade it. Also ask for a Clack or Fleck valve, not a cheap knockoff. I know they sell real Fleck parts, so see what they can offer you.