...BAD! How do I remove the smell? Hello,

We have a very small garden on our patio. The condo is situtated on a hill and the patio is barely touching the ground. A large palm tree grows from thr ground and through a little garden in the patio. The palm tree is surrounded by kind of a sand box but it's dirt...hard to explain. But the dirt is in a large contatiner and does not hit the actual ground. So when the puppy goes pee or poo in there the moisture stays in the garden. We pick up the poop almost as soon as he goes, but the pee is starting to smell pretty bad. We live around mostly concrete and there's nowhere to take him out as soon as he's up (we're in the middle of housetraining him, so we're still in the stage of praising him when he goes potty outside). Is there a product (such as an enzyme treatment or something) that will break down the urine and the odor IN THE DIRT? Would it help if we put little pebbles everywhere instead?

Thank you so much!!
It's GOOD that the puppy goes in the dirt.

We just want to get rid of the smell...


And the flies...


Oh god...