Check the listing for details. Natural Chemistry Spa 2.49Ibs.. Condition: New. Listed at 20.99 USD. Natural Chemistry's Spa pH Increaser​ raises the pH of water in spas. Spa water should be maintained between a pH of 7.2 and 7.6. Maintaining spa water pH in recommended ranges is key to proper water balance. Directions: Test spa water for pH level Compare pH test results to the chart below to determine the appropriate amount of product necessary to make the adjustments With the spa not in use and the circulation pump operating, add the required amount directly into spa water Continue circulating water for a minimum of 30 minutes Retest, adjust if necessary Spa Volume pH 7.4 or greater pH 7.3 pH 7.2 Less than pH 7.2 200gal not req. 1/4 1/2 3/4 400gal not req. 1/2 1 1 1/2 800gal not req. 1 2 3 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.