water pump

In my app i can see thst my button is toggling when im pressing that should stop the water pump but its not stopping it (I am using arduino uno just for the 5v to power the railway that is connected the vin pin and the vcc for relay)

1. Please give me some advice for solenoid water valve 220v AC Is 6mm2 Bonded wire enough ?, or I needs larger ?, what's size I needs ? (In China BC wire size is 4mm2, 6mm2, 10mm2, 16mm2, 25mm2, 35mm2, 50mm2, ... till 500mm2) 2. For safety is two water pump in parallel system, with 2 solenoid...