just bought a replacement cell (plc1400).....the prior one did fine for about 7 seasons ...i installed exactly as the old one was installed regarding 3 ports and flow direction ...top port,- in flow, bottom port - sensor,left port- outflow to pool.

This new unit has flow arrows on housing body  and the flow arrows are in the opposite direction which is how the prior one was originally installed  ......is this a problem for the unit ????   I am trying to avoid repiping of the existing pvc lines  if i must follow the arrrows