API pH UP adjuster raises pH levels in your aquarium to make water more alkaline when levels fall too low. pH is the measure of acidic or alkaline conditions in water, where a value of 7.0 corresponds to a neutral pH, pH values above 7.0 are considered to be alkaline, and pH values below 7.0 are considered to be acidic. Different fish need different pH levels to be healthy, so it is important to test your water regularly to ensure pH levels are where they should be to keep your fish healthy. pH UP pH adjuster is fast-acting, colorless, easy to use, and will not cloud aquarium water. Because it is phosphate-free and nitrate-free, pH UP pH adjuster will not encourage algae growth.