That thread is gone for good. Sorry but it attracted too much attention from the wrong people.
I would worry about rust or even the galvanized run off using something like that around water. The acids from the nutrients would have a negative reaction to the galvanization.

There are some foil spray's you can use even up to harvest day. (Hot pepper wax spray is one)

There is a difference between a sprayer, mister and fogger. You can use a fogger just about anytime. The water droplets size is so small in a fogger it dries before it hits the floor. You don't get the build up of large droplets that can cause problems using a sprayer. A good quality fogger is worth its money for anyone growing 20 plants or more. Imo. That is not a point of view shared by many. They worry that people will run out and buy the wrong type of fogger and harm their plants and blame them. Screw that there are only a few foggers out there that will work. The tri-jet fogger works very well but it sounds like a jet engine taking off.

http://www.altgarden.com/site/irriga.../ultrafog.html

http://www.nutramist.com/hydroponics.html

http://www.shirafrapa.com/eng/product.html

http://www.the-ozone-store.com/produ...s/tri-jet.html

http://www.faran.co.kr/foryou/english/e_product05.htm (the best around)

Those foggers all will make micro size water droplets and are a good choice. They are all expensive but who said growing true quality is cheep and easy?

Pea gravel is a little small and heavy. Lava rock is a better choice if you want to mix it with grow rocks that's fine.