Abstract: A modular assembly for use in a swimming pool is described. This assembly integrates the technical components and accessories for swimming pools, including at least one stair, a horizontal submerged bathing portion capable of supporting a user while sitting or lying, a filtration vat enclosing a water filtration system for filtering water to and from the swimming pool into and out of the modular assembly, and a technical vat enclosing a system for pumping and water recycling for pumping and recycling water between the swimming pool and the modular assembly. The assembly of the present invention can also include additional accessories such as a foot bath, a bathing therapy system, a countercurrent swimming system, a submerged lighting system, and a shower. The entire module includes connections for water intake and water discharge for passage of water to and from the swimming pool, and electrical power connections for accessing electrical power.