In the cold season, salad type vegies grow the best like spinach. There are several systems you can buy/build that will work. GPSfrontier has an area on this site (lesson plans) that is like a school for hydroponics that covers the basics and goes thru each system so you can get a better idea of what kind (s) will work best for you from what you can find in you part of the world. If you also go to GPSfrontiers threat on his greenhouse you will find a filter system he has made from parts from his local home and garden store. It should work for iron very well. Good luck and let us know what you decide!
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