Check the listing for details. Natural Chemistry Pro Series Liquid Cover 1 Gal.. Condition: New. Listed at 90.99 USD. Natural Chemistry PRO SERIES Liquid Cover’s advanced mono-layer technology offers users the ability to save water and money by dramatically decreasing evaporation and heat loss. - Forms invisible one molecule thick mono-layer on pool surface - Surface tension keeps cover in place - Reforms during swimming Weekly add 4 fl oz per 675 sq ft of surface area, assuming an average pool depth of 4 feet (20,000 gallons) or more. For gutter system pools or pools with high splash out or drag out: Dose 2 times per week. 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.