I am bloeing out the lines with a compressor. No main drains just skimmer. I blew out the skimmer pipe from pad and got all water out and plugged up. Next I put the compressor back on to blow out next return and the pressure built up to a point where the seal in the pipe on compressor side keeps blowing.
What could cause this? Is there a clog between the filter and 1st return? The return seemed fine when pump was running filtering the pool water.