Here is a post that may shed some light:
http://www.poolforum.com/pf2/showthr...highlight=lose

When I first switched to BBB I was burning 5-6 ppm. I switched from Prestine Blue so I had no stabilizer in the pool. Now, three weeks later I'm burning about 2-3 ppm. I went from using a 1.42 gallon jug of clorox everyday to using 1/3 of a jug everyday.