Plastic smell present with replacement Purolite SST-60 from AS.
Washed mineral tank with Clorox and replaced calcite and corosex (8:1).
Plastic smell somewhat abated (waiting for wife eval) with new resin and mineral tank fill.

Update

9/1/16 Replaced seals and spacers on MTM tank.

9/5/16 Replaced tube on Stenner chlorine pressure feed pump (was leaking)

9/9/16 Replaced resin with Purolite SST-60 and resulted in a profound plastic smell in the water, not yet resolved. Ordered problem resin from OPW. Also new 10x44 Enpress vortech tank.

9/10/16 Flushed both retention tanks, appeared that little iron was ejected

9/10/16 Ordered replacement resin and Centaur carbon from AS

9/10/16 Corrected slow backwash line leak on MTM tank by finding the valve cam was not exactly on “s” when in service. Easily corrected with socket wrench.