Bren, obviously the water power should provide a "cleaner" sound.
As far as power conditioning goes, as Alan pointed out, this is nonsense. The actual amplification section of an amplifier doesn't use the supposedly "dirty" AC coming out of the wall. The transformer, rectifier and filter capacitors in the power supply section of the amplifier supply clean DC to be used in the amplification process and no further conditioning is needed. At most, on the separate question of surges, one of the relatively inexpensive devices in the $20-$30 area could be of some limited usefulness.
