Check the listing for details. GLB Aqua Silk Shock Oxidizer 1 Gallon. Condition: New. Listed at 34.99 USD. This chlorine-free liquid formula clarifies pool water by oxidizing organic compounds completely and efficiently. – Usage: Add 1 quart per 10,000 gallons weekly. – Compatible with chlorine-free Aqua Silk products. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are UPS, FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need UPS, FedEx or USPS specifically for your order.This chlorine-free liquid formula clarifies pool water by oxidizing organic compounds completely and efficiently. – Usage: Add 1 quart per 10,000 gallons weekly. – Compatible with chlorine-free Aqua Silk products. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are UPS, FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need UPS, FedEx or USPS specifically for your order.