With HTH Sock It Granular Shock Pouch you can give your pool the powerful but safe chlorine shock treatment. Whether you’re looking to control bacteria, algae, or other contaminants, this shock treatment works hard to keep your water sparkling clean. Use this conveniently sized package to help maintain your water or for your pool opening. If using for initial water treatment during opening, add 150g of HTH Sock It/10,000L of water. When using this shock for weekly treatment, add 30g/10,000L of water.