Ok, here's the deal. My AP system is conveniently placed underneath a large tree. I did this purposely because it still allows moderate sunlight to pass through, but provides enough shelter against the HOT summers we get, or extra windy fall seasons.

The downside is that this tree litters falling leaves like crazy. I was thinking of putting some kind of transparent screen or netting above so that the leaves don't fall on my grow beds. However, I wanted to know if there was any harm in doing that. My concern would be when it rains, the water will pass through this catch screen.....and if it's metallic, it will then drip into the grow bed and eventually to the tank through the natural draining process. Would this impart anything bad into the system?

Or do you recommend some other kind of material (perhaps from the Home Depot website) that you think I should look at?

Right now, I am thinking of either some cheap roll of screen, or perhaps even chicken wire. Thoughts?