Bumping a very old thread here, but I had this same discovery in my skimmer too. I'm planning to dig out just enough of the rock/dirt to put a threaded plug/cap on it and permanently leave it sealed off.
I think I need to lower water enough in pool to where it's below skimmer, or just briefly turn off my pump, install a skimmer plate temporarily, vacuum out water and such from the skimmer (and as much as I can from that plugged line) then seal it shut with a plug. I don't think it's necessarily a negative that it's there open filled with rocks, but I don't love the sight of it when I open skimmer and pull up my basket. So that's what's leading my desire to plug it up.
I think I need to lower water enough in pool to where it's below skimmer, or just briefly turn off my pump, install a skimmer plate temporarily, vacuum out water and such from the skimmer (and as much as I can from that plugged line) then seal it shut with a plug. I don't think it's necessarily a negative that it's there open filled with rocks, but I don't love the sight of it when I open skimmer and pull up my basket. So that's what's leading my desire to plug it up.
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