Problems - mainly because there is no local dealer - need to ship in so I have issues with cost - installation? not sure if my contractor know how to connect it up - maintenance - warranty
Considering incorporating a small ERIC system into the 1st chamber of my new Pond System and the Airlift to the 4th chamber. Traditional filter media in chambers 2 and 3.
Airlift pump is definitely interesting as it can cut down lots of electric consumption for the volume of output water. The only problem is, it has not head which mean you can't use it for waterfall or bakki shower.
I personally test it with my own DIY unit and it is workable. The only thing is, you need 3 - 4 inch output for bigger outflow if your pond is more that 10mton. Also, the return pipe from your filter to your pond must be just above your intended water level or same level will do.