The traditional bottom installation consists of a main riser connected to the main ventilation pipe at the bottom of the pool, and the main ventilation pipe at the bottom of the pool is further divided into several ventilation branch pipes; The main ventilation pipe and branch pipe at the bottom of the pool are fixed to the bottom of the pool through adjustable brackets and expansion screws, and the aerator is installed on the ventilation branch pipe; Distributed in units. Disc aerators and tubular aerators can be used.