[uwe]

Smily,

I figured it is supposed to go near the pump, because this is where you can get to it easily, and it's also where it's shown on the literature. It probably matters only little where it goes, as the pressure surges are in the entire water supply. But if they originate from the pump, then the accunulator should be close to it as to neutralize the water pulses. The accumulator will also store a little bit of water under pressure, so initial flow at the faucets should be smoother, with the pump running a little bit less, especially when usng the faucet for short times only.
Good luck!