Replace any small jets or 'y' pieces for larger ones to minimise freezing.
Use 2 layer pole hose i.e. yellow lite 5mm stuff.
Don't leave pole lying on the ground when not in use.
Keep water flowing through hose as much as possible if hose unreeled and keep wound up when not in use to prevent freezing.
Keep pump insulated from tank to hosereel and you minimise freezing of system.
Insulate van with plywood and insulate tank and there is no need to put a heater in your van overnight.
Also insulate any hoses from water purification to your storage tank and from transfer tank and you're sorted.
Pre preparation prevents poor performance
