Once the pH range is established between 7.0 and 8.0 ppm, an application of this patented formulation will lock in pH level between 7.2 and 7.8 ppm. Use every time spa is refilled to lock in pH level for three months. Availability: Usually ships in 1-2 weeks. Ess - 106340 No Shipping Charge in the USA (lower 48 states)!!!!! Please allow 5-7 days for shipping on small items. Please allow 5-14 days on large items such as filters, heaters, and diving boards. All filters, heaters, and diving boards are shipped ground freight. Check your order when received. Any claim of damage must be placed with the shipping company upon receipt. Privacy is not a issue no mailings and selling of any customer information on this site will be allowed or practiced. Also please visit our main web site WWW.AQUALINEPOOLS.COM or check us out atThe Better Business Bureau Online and our "NEW" on-line store www.Backyard-Warehouse.com All Images-Logos-Text are © Copyright - Aqualine Pools 1999-2006