I finally got around to cleaning my DE filter grids this past weekend, and had a couple of questions. One: the little strainer at the top of the manifold is pushed in and appeared full of DE. What is the purpose of that device? Second: when I started the pump after reassembly, I got air through the returns for a minute or so which appeared to be air in the filter being pushed out. Is that normal / safe? Third: I have a little DE in my pool which is consistent with every time I have charged my pool. It ultimately clears up in a few weeks, but is that a sign of a problem serious problem? Thanks in advance!
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