I think I found a leak

[rxman]

I have been losing water from my pool. I think this could be the source of my problems. I have attached pictures. This is of a leaf/debris canister. In the gap between the two plastic pieces is concrete as well as dirt. Yes, dirt!
How do I fix something like this?

 

[Bama Rambler]

The first thing I'd try to do is find out why it shifted. Once you've done that you can use epoxy or other waterproof sealant to seal it up.

 

[ptblues2]

I would suggest powering out the dirt with a power nozzle on a water hose. Any remaining dirt, use a knife blade to remove. Allow to dry. Wipe the crack out with alcohol and allow to dry. Fill the crack with silicon.

 

[rxman]

How would I determine how it shifted? I have no idea.
The gap between the two pieces is 2" to 3". Is that too large for silicone?

 

[Bama Rambler]

Has your pool, deck, etc. heaved?

2 to 3" is a lot of movement not to notice that something has moved.

Back off a ways and shoot some more pics. Maybe someone will see what's going on.

 

[rxman]

I'm sorry. I'm not sure how or even if it has shifted right or left. The gap (as far as the width) has been there since day one. My coping is very thick and with the deck poured there was a gap there. The gap has some concrete. I think it was supposed to be filled in smooth but wasn't. I really don't know.

 

[ptblues2]

You can seal the cleaned gap with a 2 part sealant used for expansion joints on the pool deck.

 

[Just-a-PB]

That is just a "Beauty ring", basically a filler above the leaf basket.
Your pool water should never get above the lid you see below, so that should not be an issue.
You can certainly clean out some of the dirt and run a bead of silicone to keep it clean.