Party Pool Color Additive, Blue Lagoon 8 oz. An Easy and Inexpensive way to add sparkling color to your pool, any time, in minutes and it lasts for days. Party Pool!® is an exciting pool product developed in 1985 in Phoenix, Arizona by a Pool Cleaning Company to add a sparkling color to customer's pools. One customer was so excited about the product that they established a partnership and began selling Party Pool! ® to local pool supply stores.