(ALGAECIDE) is a powerful all-purpose algaecide. The Yellow Stuff quickly eliminates all types of algae breakouts, and is also a highly effective algae preventative. The Yellow Stuff is safe for all pool finishes and works with all major pool sanitizing systems. Swimming can resume in a few hours. Please note: This product is not available in AK, AL, CA, CO, DE, HI, IA, ID, IL, IN, KS, KY, MA, ME, MN, MO, MT, NE, NH, NJ, NM, NV, ND, OR, RI, SD,
VT, WA, WI, WV and WY.