I have a new ORP/Ph controller and probes. The ORP is reading very low (430-490). My chlorine levels are over 5 ppm. Thiis is the same problem I had with the last controller. pH is 7.5, CYA = 40 hardness = 260, Alkalinity = 120. Temperature is 76F. Iowa code requires ORP readings above 660. What could be impacting my readings?