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1 other thing too: If you get a BRS system, it will come pretty much fully assembled, and the filter cartridges will already even be in the chambers.
However, they do not wrench the chambers down tight, so if you don't tighten them with the wrench (which is included) before the first use, when you turn on the water, it will make a huge mess. I may or may not have made a huge mess when I first installed my system