Maintenance includes, but is not limited to: sustaining healthy water chemistry, brushing the walls, vacuuming, cleaning the skimmer, and cleaning the filter. We also do additional shock treatments when necessary, such as when any of the following occurs: hefty rains and windstorms, more swimmers than usual, foul odor from the pool water, extreme temperatures, swimmers with burning, red eyes Algae growth, and murky, slimy water.