I have been running into problems with my DE filter returning DE back into the pool. After first I thought it was the filter grids but, after complete replacement of these I was still having the same problem. Upon further inspection I found a large crack on top of my manifold right next to the internal air bleed assembly, which has also deteriorated. So long story short, I have purchased an after market manifold with the internal air bleed assembly built into it. I was wondering if anybody had any opinion about these, are they just as good or have I made a mistake? I have a Pentair FNS Plus 60 DE Filter.