Got the new fill done and balanced, but somehow I overshot my salinity target by 400ppm. I do not understand how 6.5 lbs of salt on the last fill was 1600ppm, and 6.5 lbs of salt this time was 2000ppm. I use a kitchen scale for my chems, accurate to the half oz. I added more fill water to take the tub right to the brim and that brought the concentration down to 1800ppm, which will be fine for this fill, I'm just annoyed that I make all these efforts to be precise and it still ends up a big hassle of check and recheck over and over. The only thing I can think of that might have skewed it is that I didn't check the salinity before I added the salt. So maybe there was some salty water lurking in the plumbing? I wouldn't expect the tap water to be very salty, right?