This filter removes over 500 contaminates has an 11 gal/min flow rate and the icing on the cake IT AUTOMATICALLY BACKFLUSHES ITSELF! The link I provided is for the filter with the Poly glas tank. There is also a tank available in stainless steel. It may seem expensive, but it filters up to 1 million gallons.
Also, I advise you to check out BIOTA's website for more on corn-based containers and to see if it is available in your state. Go to biotaspringwater.com
I apologize, I can't remember the name of the website or what I searched for, you could probably use a couple sentences from the article to search with.