Ultima S.O.S. is a multi-functional shock that oxidizes and boosts free chlorine concentrations creating clean, clear water fast. The unique formulation contains a powerful clarifier, oxidizer and chlorinating agent and will not affect the water's pH, total alkalinity or calcium levels. The built-in clarifier ensures contaminants are more readily removed by routine filtration which prevents dull, hazy water. You can swim in as little as 15 minutes after S.O.S. works its 4-in-1 action to eliminate organic wastes.
Use weekly to maintain sparkling clean water.
Since S.O.S. is buffered, it will not affect water balance. S.O.S. is specially formulated to prevent dull, hazy water. Add S.O.S. to pool water every week to oxidize contaminants introduced by bathers and to maintain sparkling clean water.
Chlorine, bromine, ozone and salt water sanitizing systems
S.O.S. is a quick-dissolving shock, oxidizer and sanitizer in one.
Your cost is so much cheaper than where I was getting this. I have been using this for years. Great stuff!