The size of the conatainer depends on how much media your going to want to use. Also the avalibility of such a container that is air and water tight can become a quest in itself. 5 gallon buckets with lids are often used for tring to make this filter, but I've only seen one or two actualy work for a long period of time.
If your looking to save money on a filter, go to ebay. Most DIY projects aren't really money savers in the end. Most of the projects I do are for the sake of DIY because I enjoy it.
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