To keep your inflatable pool water fresh, you should follow these simple steps – firstly, keep the pool covered when it is not in use, as this will prevent debris and dirt from entering the pool water. Secondly, clean the pool weekly using a pool vacuum and skimmer net. Thirdly, add chlorine or other pool sanitizer as needed to maintain the proper pH level, and test the water regularly using a pool test kit. Lastly, consider using a pool filter to keep the water circulating and clear, or drain and refill the pool periodically to prevent stagnant water. By following these steps, you can keep your inflatable pool water fresh and clean all summer long.