just to add filling up and emptying all the time with maxi ? you will with time realise how much solution to put in from start of job and how far you will get before emptying, if you had a bigger machine you will still use same amount, unless you have a silly 500 psi pump. so how this effects this machine is beyond me, just as a silly numbers example
lounge 35 litres to do
maxi 30 litres 3 buckets to start 1 to finish
other 50 litre machine 4 buckets to start
whats difference you still put 4 buckets in as for what you take out again i would hope it was equal with in reason.
also your fear on maintence with in reason do it yourself maxi un clip waste tank, remove filter, three scews lift air filter off, pull motor up, pull conecter of both sides, conect new motor sit back in gaskets, fasten up there you go. pump little hard as a bit tight on space.
john kelly sells maxi and vernons machine never met the guy but posts have seen last couple years all good, is website straight forward and looks good, would say he would give you staight advice, if your straight, with what your wanting to do and achive,
with your machine.
darren