The plant room houses all of the technology that regulates the pool's operation and ensures it runs smoothly around the clock; this article discusses some of the important design issues. The control system may be fully automated, but it can also have many manual controls which may be used by pool owners to adjust the operating parameters of the pool during their visitations. The plant room includes the following major components: pump, filter, heaters, and chemical injectors. These elements work together to provide water for leisure activities in the summer and protection against contaminants in other times of the year. The plant room is located below ground in most cases; however, it can be located above ground on a roof or in a separate building if desired. Swimming pools require regular maintenance to ensure they are safe and functional for use. Regular cleaning is required to remove debris that can cause accidents or unappealing odors. The filter should be cleaned regularly with sand or diatomaceous earth to prevent particles from being drawn into the circulation system and out of compliance with local regulations. Chemical treatment is necessary for disinfecting the pool during periods of nonuse. The chemicals used to do this are extremely dangerous if not used properly or applied by someone who does not know how to treat a pool safely.