My husband and I purchased a used 2007 DE providence 2 (370 gal) that was in excellent shape. Before getting the hot tub up and going we spent hours looking up cleaning procedures and how to add chemicals. I felt like we had a good understanding of how to get our water balanced just right but now that we have it up and running I feel more lost than ever! I read waterbear's sticky on starting up a bromine spa. We filled the hot tub using a prefilter as we have some rather nasty well water. We let it get up to temp and tested before we added chemicals. TA and Ph were both high. We added about 2oz of broma-start and then added 2oz of spa gaurd shock-oxidizer. We waited a few hours and tested again. Bromine levels showed 0, and ph and ta were both still high. So we added 2.4 oz of spa essentials ph decreaser, waited 30 minutes and no change. So we added another 2.4 oz and still no change. The next day after work I decided to add 1oz of shock to see if bromine levels would rise, nothing! I added another 2.4 oz of ph decreaser as well and waited, tested again and still no change! We have 2 different brands of test strips and both are showing the same results bromine- 0, ph- 8.4, and ta- 240. We do have a floater with bromine tabs in as well but from what I've read they can take a while before they start to work in the water. I'm sure I'm doing something wrong. Sorry to ramble, any advice would be greatly appreciated!!!