Yes, quite a bit of scale. I now did put the lower boiler part quite long time in the Citrix acid solution, in a small bucket, so that I could position it at various angles so that all internal places are touched without compromising the solenoid.
I have the Osmium zero, for one and a half year, replaced the filters twice. I did not notice the ppm creep before, maybe try a new set of filters.
Initially used the Lelit with the resin filter for some weeks …
The mineral solution is basically sea water with removed NaCl. It doesn’t mention anything about removal of calcium, just magnesium plus race minerals. Maybe calcium is a trace mineral in their view, will send a mail …
Now wait for the gasket and see where the ship hits the shore … :)