I just got a set of prints in with all the usual "as typical " stamped all over them. One thing caught my attention though. The mechanical plan calls for a chemical shot feeder to be included in the loop piping, for a closed loop vertical system. Anyone have a point of refferance on this? I am assuming that it is to address water quality in the loop? Why not spec a given water quality to be used and tested for the system? Do you think that the engineer thinks so poorly of the pe pipe and joints that he is anticipating a large demand on the native water from the auto fill? Ant comments?