I have noticed recently a white, sand-like residue in the cleaner's bag. I let it dry and it is a fine dust resembling the white cement used in my plaster mix (SunStone). My numbers seem reasonably balanced (FC=6.0, TA=70, PH=7.4, CYA=70, Ca= 600 (it has always been this high), salt=3000. Could it be my plaster is "peeling off"?
Any ideas/suggestions are welcome