Strong's FORGE-CAST™ and ENERGY-LOK™ TechnologyStrong Spa's patent-pending, dual-walled FORGE-CAST™
system is extremely energy efficient, reduces noise and still provides easy access to all internal components.
unique ENERGY-LOK™ insulation system injects high density foam between the walls of the dual-walled system resulting
in no harmful release of CFCs into the environment and a highly efficient thermal system.
by the pumps in the internal cabinet air space is recycled and utilized by your spa, saving energy and money!