Spend more time enjoying your backyard swimming pool and less time taking care of it with the EZ Spa EZ Pool 10 Lb Concentrated Weekly Algaecide Swimming Pool Treatment. This swimming pool water treatment comes in a pail with 10 pounds of powder. Designed as a weekly treatment, 10 pounds will last average pools for months, letting you worry less about algae build-up and more about planning your next barbecue bash. The blend features a stable oxidizer to break down contaminants and an algaecide that kills surface plants before they can sprout and also prevents scale build-up on your pool's walls. Best of all, the pool chemical maintenance kit has a preventative design that uses fewer chemicals, meaning your water is easier on your skin and eyes and won't leave bathing wear smelling like chlorine. Simply start using the EZ Spa EZ Pool 10 Lb Concentrated Weekly Algaecide Swimming Pool Treatment once a week at the beginning of the season and make minor chemical adjustments as regular testing dictates. Note: This item cannot be shipped to California and will be canceled/refunded if an order is placed.