Check the listing for details. Poolife Defend+ 1 qt - 2 Pack. Condition: New. Listed at 61.98 USD. Poolife Defend+ is an effective and efficient solution for those who want to keep their swimming pool clean and clear of algae. This algaecide is designed to kill and control algae growth in the pool, preventing unsightly green, black, and yellow discoloration. It is a non-foaming algaecide that clarifies the water while eliminating algae. Poolife Defend+ is a dual-action algaecide and clarifier that can be used both as a preventative measure to stop future algae growth and as a treatment to get rid of visible algae. With its fast-acting formula, it is easy to use and ensures a healthy and sparkling pool all summer long. Product Features: Ideal for treating green, black, and yellow algae Shake well before measuring out the required amount of product Combined algaecide and clarifier Fast acting algaecide that kills, prevents, and controls algae