not on a permanent basic, if they are organic maybe but pebbles etc the pump will fail sooner than later. Using this for a garden sink but have a strainer at the inlet drain to collect any particles.
If I remember correctly you guys have a single phase 220 - 240 volt standard. so getting one from the usa you would be looking for a commercial duty one as many commercial buildings have high voltage single phase. or you would need a voltage converter.
Yes, it can be operated manually or on automatic setting.
Yes, this pump is more than adequate to handle a dishwasher and the bar sink faucet flow rate combined.
Yes, it would be ideal for a bar sink or utility sink.
Yes, a smaller diameter pipe can be used with a reducing fitting, as the advertised 21 GPM will be only ever reach around 18 GPM, but still sufficent.
Yes, you can mount this pump either horziontally or vertically, the pump and the impeller are separated so this unit can be mounted in a variety of positions.
Yes, you can adjust it by varying the manual red and white valve.
No, Since the pump includes a built in check valve it does not require a vent. It can be tapped directly into the drain pipe.
If used outdoors, it would nee to be protected from feezing