water should be balanced according to your ACE instructions and up to temperature(100+ degrees) before any salt is added...getting your calcium withing the recommended range of 25-100ppm is most important, if your filling with standard tap water most likely you will need 1 or 2 vanishing act bags...if your house is setup so that you can fill with soft water than you may be within range or can add calcium booster to bring it up. The best way to test your water is with a Taylor K-2006 drop test kit.
My Taylor kit shows the hardness right at 5 drops 50ppm and the alk at 80ppm. Exactly on target with the ACE instructions. I will go buy some PH indicator and verify the strip reading. The dealer told me to add salt and then do the vanishing act when we initially filled it. The vanishing act brought down the hardness from 150PPM to 50PPM. It ran about 2 days with the ACE on before using the vanishing act. Should I just drain the tub and start over or do you have other advice. Never had this much trouble with my saltwater pool.