You might take a look at KoolAir MagDrive (no shaft seal and isolated, extended dry run times AND thermo-overload with auto-reset)--they have 220 50hz versions and these pumps have an excellent track record.   500 gph  version could be used as Dessalator feed and the 1000 (54 liter/minute @ 50hz) would work with AC.  Price is very good as well  http://search.defender.com/?expression=KoolAir%20Pumps  http://www.defender.com/product.jsp?path=-1|6880|2061076|2061077|2234240&id=3427174  http://www.defender.com/pdf/901764.pdf  These are similar to the March pumps that Coastal Climate control is using.