how old is this product? I acquired a Kohler jetted bathyub with 4 jets and 2 misters, one on each side by the handles. This tub has copper tubing to the jets, it has a control box underneath for the motor. I need to know what how to start the jets, is it water temp or water depth? Id like to know because the tub works as far as I know. . also seems the number on the tub is K810. Help Please someone!!