Auto refill - can you explain?

All clean. The stuff in there were long pieces of grass. It was so incredibly dirty that the bottom was full of sludge. But got it all cleaned out and we can not figure what that hole is up on top but made sure that the water hit below that. I ran my hand all through it to check for cracks but it was all smooth. We think we got it figured out and will just keep a watchful eye to make sure it does not start running continously. As well as put bleach in there to hopefully keep it clean. If that does not work then maybe every 3m or so I will clean it out like I did last night. Thanks again for all your help!
 
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