Oxidizing Shock For Pool & SpaOne bucket, two jobs. AquaDoc Chlorine Free Oxidizing Shock is built for owners who maintain both a pool and a hot tub and don't want separate buckets of shock for each. The 10 lb size handles weekly pool oxidation plus regular spa shocking from a single product. The active is potassium peroxymonosulfate (MPS), the standard oxygen based shock active. Instead of adding more chlorine, MPS works by breaking down the organic load in your water: body oils,