Vinyl Shock 454gdichlor blend 34% Effectively oxidizes org. anic material in your swimming pools, combined with water clarifier, produces sparkling water with no cloudy residue and no increase in pH. No pre mixing, shock and swim in 15 minutes. With the pump in operation, add pouch per 50,000 litres of water by broadcasting in deep end of the pool. Always read labels and following safety instructions;. . 1 1. .