I have a pool & spa. The return line for the spa is clogged and I am not sure how to clear it.
I have a valve to switch the drain from the spa or the pool. That works fine.
I have a valve to switch the return to the pool or spa. If I set it to the pool, no problem. If I set it to the spa, the pressure immediately builds and it will blow the top off the filter if I don't immediately turn off the pump and release the pressure.
I have taken off the valve cover and snaked the line for about 15-20 feet. At that point it feels like I can't feed the snake around a corner rather than feeling a clog.
How should I attack a clog like this? What could the clog even be, seeing as how it is downstream from the filter?