Pools typically have two main drains for several important reasons: Safety: One of the primary reasons for having two main drains is safety. In the past, some pools only had a single main drain, which could pose a safety risk. If a person or object were to block the single drain, it could create a powerful suction force that could be dangerous or even fatal. Having two main drains reduces the risk of entrapment accidents by distributing the suction force. Improved Circulation: Two main drains help improve water circulation in the pool. They create a balanced flow of water across the pool floor, which helps in the removal of debris and helps maintain consistent water chemistry. This circulation also prevents stagnant areas where algae and bacteria can grow. Efficient Filtration: Proper water circulation facilitated by two main drains ensures that water is evenly distributed to the pool's filtration system. This helps the filter work more efficiently in removing impurities, resulting in cleaner water. Compliance: Many pool safety codes and regulations require the installation of two main drains as a safety measure to reduce the risk of entrapment accidents. In summary, having two main drains in a pool enhances safety, circulation, and filtration while helping pool owners comply with safety regulations.