Hi, I have an iron filter and a water softener both of which use a hall effect sensor to meter water flow and trigger the regeneration cycle after a user set number of gallons of water have been consumed. The iron filter water usage sensor is now recording 1/2 the usage that the softener is recording. I took the unit apart where the rotor is plumbed in and cleaned it and checked the little rotor and it spins freely. Unfortunately this did not solve the problem. Any suggestions? Also, is it possible to plumb in an external hall effect water flow meter (like the ones on ebay) if the built in rotor assembly is defective? The red wire has 5V on it and the blue wire measures 1V. The iron filter is a Rainfresh model CAFE 948. I contacted tech support but did not get a satisfactory reply. The reply I got was to set it to regenerate every 3 days. This is too often and wasteful as my water has low iron content and I do not consume that large a volume of water; additionally my water usage varies considerably from day to day throughout the year. Also I live in a rural area and do not want to load up my septic tank with that much water. I have attached a photo of the iron filter's electronics.