Safely and quickly lower the pH in your freshwater pond for more acidic water conditions with API POND pH DOWN Pond Water pH Reducing Solution. pH is the measure of acidic or alkaline water conditions. Water with a 7.0 pH level is considered neutral. Levels over 7.0 are considered alkaline, and levels under 7.0 are considered acidic. Different fish need different pH levels to stay healthy. Levels that are too high or too low can cause stress, illness and death, so pond water pH testing is crucial to the health of your fish. API POND pH DOWN Pond Water pH Reducing Solution is designed to lower pH in water that tests at an undesirable level. It is colorless and easy to use. It will not cloud or color water, and because it's phosphate- and nitrate-free, it will not encourage algae growth. Use as directed to keep pH levels in pond water between 6.8 and 8.0, an ideal range for garden ponds. With API POND products, it’s easy to keep a beautiful pond. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your pond. API POND Pond Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as koi, catfish, perch, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your pond. Make sure to use all products as directed in order to ensure the best results.