Amazon.com : In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms- 24 X 1 Pound : Patio, Lawn & Garden
Amazon.com : HTH 52037 Swimming Pool Care Shock Advanced, Swimming Pool Chemical, Cal Hypo Formula, 12 Count(Pack of 1) : Patio, Lawn & Garden
Amazon.com : In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 12 X 1 Pound : Pool Shock Packets : Patio, Lawn & Garden
Amazon.com : Champion Pool Shock - Ready to Use Liquid Chlorine - Commercial Grade 12.5% Concentrated Strength - 4 Gallon : Patio, Lawn & Garden
Clorox Pool&Spa 6-Pack 16-oz Pool Shock in the Pool Shock department at Lowes.com