On a new build I really think you should talk to the builder about what he's trying to do with your finish (in case he's doing a high-acid startup) and get him to put the finish care instructions, including water chemistry requirements, in writing. You don't want to give him (and SGM) a cudgel with which to nullify your warranty. In the event of a problem they'll probably both point at each other anyway, but you don't want them to be able to point at you as the source of the problem.

Once you get the care and feeding instructions in writing (if the builder won't give you anything, SGM's Diamond Brite requirements can be found here), maintain a water testing log so that you have some record that you've done your part.