About once a month we have all the grandkids (ages 4-14) in our hot tub in one evening. The water will be crystal clear before they get in. I double shock with Renew when they get out. The next morning, the water is so cloudy you can't see the bottom. All the chemical levels are good except bromine, which is virtually gone. Foaming and scummy bubbles are horrible. It takes up to 10 days to get it back to normal. I have to crush 2 or 3 bromine tabs, use sodium bromide liberally, and open the floater completely. What on their little bodies is killing the bromine levels and what would it take to get back to normal faster?