• HydroTools by Swimline Chlorine Test Oto/Phenol Red Solutions is a pool water testing kit that includes both OTO (Orthotolidine) and Phenol Red solutions.
• The OTO solution is used to test for chlorine levels in the pool water. The solution turns yellow when chlorine is present and the deeper the color, the higher the chlorine level.
• The Phenol Red solution is used to test for pH levels in the pool water. The solution turns red when the pH level is between 7.2 and 7.8, which is the recommended range for swimming pool water.
• This testing kit is designed to work with HydroTools by Swimline testing kits, but can also be used with other brands of pool water testing kits.
• The OTO solution is used in small amounts, usually one drop per 5 milliliters of water, while the Phenol Red solution is used in larger amounts, usually five drops per 5 milliliters of water.

Swimline is a family-owned and operated business that has been manufacturing and distributing high-quality pool and spa products since 1971. The company is based in New York and has grown to become one of the largest manufacturers of above-ground swimming pool liners, covers, and accessories in the world. Swimline offers a wide range of products, including pool floats, toys, games, and maintenance equipment. The company's products are designed to enhance the swimming pool experience for both children and adults. Swimline is known for its innovative designs, quality craftsmanship, and competitive pricing. Over the years, Swimline has established a reputation for providing excellent customer service and support. The company is committed to ensuring that its customers are satisfied with their purchases and offers a comprehensive warranty on all of its products. Today, Swimline remains a leader in the pool and spa industry and continues to innovate and expand its product offerings. With a focus on quality and customer satisfaction, Swimline is a brand that pool and spa owners can trust.

We don't accept return, but if the product you receive is broken or wrong, we will provide full or partial refund.