If your setup has return to tank you may want to antifreeze the return as well.
Both my machines are done the same way. The whole system is anti freezed.
25 litre tub, water inlet hoses into this and hose outlet into the same container, creating a loop.
Run machine till the outlet hose runs blue. Turn off
Stick a trigger on the outlet, switch on and let some run to the return to tank.
Whole system sorted for the winter, not just the pump.
Rob