HI one question, can i take tank cold water feed piping at 22mm and reduce to 15mm near the pump? the distance is about 2.5 metres before a drop into the pump (not yet installed) or should a just have 15mm all the way? tank connector and full bore ball valve? is there a benefit to 22mm and reducing into a 15mm pump inlet? im a complete beginner so dont abuse me please. thanks