3 Pack SimPure V7 Water Filter Replacement, 20K Gallons High Capacity, Replacement for SimPure V7 Under Sink Water Filtration System

This is an under sink water filter replacement unit that is specific to the filter unit we have. As far as we know, we must use this filter to replace the filter that was initially installed. In the unit. We have no objective way of evaluating the effectiveness of the filter. It seems to be working. As measured by. the amount of thesediment. In the one we've replaced.