How to prevent black stains around the water level on the top ring?
Black stains around the top ring are normally caused by suntan or sunblock lotion that float on the water surface and accumulate on the side. Clean the inflatable ring after each use with a damp cloth, and cover the pool when the pool is not in use with a pool cover. For a better hygiene, always use an Intex Wall Mount Surface Skimmer to clean the water surface on a daily basis, and change the pool water once or twice per summer season.