Patent ID: 8758627
Filing Date: 2014-06-24
Classification: B01J,C02F

Abstract:
1. A method for determining when a resin bed of a water treatment system is exhausted, the method comprising: measuring a volume of fluid that has flowed through the resin bed; retrieving an initial water hardness setting; retrieving a resin bed capacity; measuring a hardness front location along the resin bed using at least one sensor; calculating a new water hardness setting using the hardness front location, the measured volume of fluid that has flowed through the resin bed, and a placement of the at least one sensor; estimating a remaining fluid volume capacity using the new water hardness setting, the resin bed capacity, and the measured volume of fluid that has flowed through the resin bed; and determining that the resin bed is exhausted when the remaining fluid volume capacity has flowed through the resin bed.