So I just got my hot tub a week ago. it was used. A 2015 that looks to be in good condition. I have been testing the water daily. Mid week I shocked it because the water got a bit cloudy. Also used enzyme and raised PH a bit. A BUNCH of yellowish scum was in the foam, and settled as this gummy stuff on the water line. After a couple hrs of running jets and cleaning, it finally got better. Shocked 2 days later and a little more came up and it was whitish color. What should I do? My water is now crystal clear and tests are showing good water. Thanks