My in ground Spa Air Blower (Polaris 1-480-02) which is installed above the water line has water pouring out of it when the spa pump is on but the air blower is off. I recently emptied the spa and pool out to acid wash and not sure if some of the acid got to the valve or I assume this is a failure of the back blow check valve. When I removed the air blower motor and put a wire snake down the pipe is goes down 10 feet before it stops. I am not too excited about digging down 10 feet in a very awkward area to swap out the check valve. My questions are:
1) Can I put another check valve closer to ground level thus having two or will that be too restrictive to the air flow.
2) Any ideas of how to repair the old one without replacing it or diggiing it up. Something like pour magic juice down the pipe and watch it magically repair itself.
3) Any other ideas or should I start digging?