Safety cover not draining water

I think the replies above would be for a solid cover. Taking a different look at this, is this a mesh cover? If so, it's not tight enough and should not be touching the water. It appears to not be an issue of it not draining, but that it's touching the water which makes draining impossible.
 
Hard to see the springs. The instructions on my Loop-Loc say the springs should be compressed 60%. Also can't see any springs along the edge of the stone wall so I don't see how the cover can be tightened.
 
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