Thanks hottubdan; the dealer told me to go ahead and top it off and then add between 2-4 ounces of stain & scale depending on the amount of water that went in. I have done that. Before I added the water I tested the PH, and it seems to be above the 8.0 mark based on the color chart. The level of alkalinity also appears to be high, at 180. To be honest though, none of the colors actually match that on the test kit, so I can't be 100% sure. I guess it would be good to take some of the water to the dealer for analysis.