Wasn't with out difficulty however...changing the membranes was easy...30 minutes...putting it back together ...easy...but would it run properly?..No..why?...system full of air...of course I'd plumbed in the pump for the fridge compressor condenser and its sucking air in through that circuit ...well block it off...don't seem to be able to do that successfully..Ah I know...why not connect up the fridge condenser as it will be...ok..good except the waste from the watermaker is now running bakwards through the condenser to the pump...and leaking as its all under pressure,.....hmm..Ah, I know..one way valve!! Trot up to the local chandler where everything is gold plated (well you'd think so by the prices they charge!) and get a one way valve...put it in the waste line from the condenser and ...hey its all working !!
Time for a nice cup of coffee from the Bellisimo Cafeteria machine !!! Excellent !