Seaflo make a fantastic 1100 GPH bilge pump with a very reasonable AMP draw. Fully submersible.
This is the perfect size bilge pump to run a 6 inch dream mini mat. If you're after a bit more pressure for a 6 inch highbanker we would recommend the TMC2000.
As with all prospecting adaptations bilge pumps were not designed to run our sluices however there are some great products that are safe to run for extended periods, and this is one of them.
Capacity: 1100 GPH - 69 Litres per minute
Voltage: 12 Volts - 3.3 amps
Size: 110 x 85mm
Hose ID: 28mm (1 1/8'')