i have a cal spa apx 5 yrs old .water is backing through an air hose .this model doesnt have a blower motor ,it has an air venturie to take in outside air . water eventually makes its way into the access panel area where all the components are .how do i stop the madness???????????

the problem is at the jets (probably only one jet) - check for blockages and properly inserted jet internals and intact gasket/o-ring seals which prevent water from entering the venturi lines.