The main drain of any system is situated in the deepest part of the pool or spa, the place where most debris settles. The main drain is also the greatest source of suction for any filtration system. For these reasons, the drain should be well equipped to remove debris and allow for a sufficient flow rate for high performance pumps. Additionally, the drain should be equipped with an anti- entrapment system to avoid dangerous human blockages. We will only install the AVSC (anti-vortex single channel drain) Main Drain, offered by A&A Manufacturing. This is the only unblockable drain of its kind that is certified by NSF International and is compliant with the Virginia-Graeme Baker Pool and Spa Safety Act. Get peace of mind with this maximum safety drain that also cleans your pool. Unlike traditional drain configurations, the AVSC Main Drain is capable of removing debris, which would otherwise be trapped by a traditional drain cover, and depositing it in the filtration system, where it belongs. Lastly, these drains have a non restrictive design with regards to flow rate, allowing up to 227 GPM, thereby, actualizing the true potential of a high performance pump.