Robb

Well, I have had my new hottub - 2011 Vista running for a few days. Steps to prepare my tub are below. I am getting the brown/yellow ring on the tub and need to clean it every day or so. Like today I see two rings, one higher and lower. I was in it last night so water level rose a bit. I have used the tub 3 times for total of 1.5 hrs. I shower before each time and suit is rinsed without dtergents. 1. Filled tub with prefilter 2. Left Vanishing Act calcium pillow on for 24 hrs / flipped after 12 hours. 3. Took water sample to dealer and they told me to bring up alk, ph (7.1 tested) and added 3 cups salt. 4. I shocked the water with a little chlorine to jump start ACE. 5. Added 3 more cups of salt spread out over time and salt level right in middle for 500 gallon tub. 6. Cholorine levels are good and all seems good. BUT....my PH is rising every day. I used a fisher scientific $800 ph tester and with it calibrated yesterday it was 7.4 to 7.6 tested in 3 areas of tub with water at rest all day. Today is was 7.8 at three different dips in the tub. I went in the tub last night alone for about 25 minutes. There is a yellow/light brown scum at the water line. The ACE 1 page started manual states on the WEEKLY check that PH will increase for the first few weeks. I am trying to figure out why this is occuring. Is the tub releasing the elements from the vanishing act pillow or stabilizing? Just trying to understand and wonder if this will go away. ACE veterans would like you help.