The "pressurized accumulator" I'm referring to is just a water storage tank in the form of a bladder inside an air-pressurized steel vessel. A smaller version of the tank you find next to practically any well-pump to conserve pump cycling/wear and tear/smooth pressure spikes... Its participation in this system is wasting water, not conserving it.

It's included from the factory just so nobody has to wait for filtered water to pass the membrane at time of use, instead experiencing an instant powerful jet of water out of the filtered water faucet.