Bottle drain grid for hydroponics (to help prevent clogs)

I use clay pellets in my small hydroponics system and found that occasionally the small ones could cause a clog. I created this simple drain grid to hold back the clay pellets and allow the water to flow at the bottom of a 2-liter bottle.

Added the 3dponics project to sources as the design was inspired by the usage of the 3dponics drip nozzle with clay pellets I happen to be using. Hopefully this helps prevent some clogs.