Okay - thanks for the info. DH was telling me that you are supposed to keep it below 6.8 so more of the "plaster comes off" so that more of the color shows through. Documentation says closer to 7.4 - so I will try to keep between 7.0-7.4.

I don't think the builder is doing an "acid" start-up they did an acid wash on the finish already and his answer was that you are supposed to add acid everyday - so I don't think he is shooting for a specific number - just doing what someone told him.

We tried talking to the finish guys - but no one spoke English.