We have a new Viking Royale ETS tub and are having issues keeping the water balanced. We also have a 13k gal pebble pool which we have no trouble keeping balanced using TFP's test kit and methods. But this hot tub has got us scratching our heads. We can't seem to keep the chlorine level up. Even after shocking, it's back to 0 within 2 days. The TA is at 70. Our pH fluxuates pretty dramatically. We can't figure out what we're doing wrong, and now we have cloudy water. We've been using the granulated dichlor for sanitizer. Any advice?