Check the listing for details. Natural Chemistry Spa Chlorine 5lb.. Condition: New. Listed at 69.99 USD. Natural Chemistry’s Spa Chlorine Concentrate is specifically designed for spas to help control bacteria and algae in spa water. Features: Specifically designed for spas and hot tubs Concentrated formula Controls bacteria and algae in spa water Directions for use: Ensure all spa and hot tub equipment is working properly. Backwash/clean the filter system following manufactuer’s directions. Adjust pH to between 7.2 – 7.6. When using other products as outlined in the directions for this product, always follow directions on those products. When used as directed, this product is effective as a spa and hot tube water disinfecting agent. Maintenance dose: With pump on, add 1/2 teaspoon of this product per 100 gallons of water (or 5 tsps. per 1,000 gallons) as an initial treatment. Repeat at 15-20 minute intervals until a residual of 3-5 ppm of available chlorine is established as determined by a test kit. A test kit must be used regularly to determine the frequency of additional doses of this product needed to maintain the chlorine residual of 3-5 ppm. Superchlorination: Use one teaspoon of this product per 100 gallons of water (or 1/4 cup per 1,000 gallons). Superchlorination may be needed on a nightly basis in a heavily used spa or as infrequently as once a week in a moderately used spa. 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.