Minimum area needed would be 2' x 2' and that would be putting the pump internally as Gary did and without an RO reservoir. You "could" add a float valve inside the drum and have it fill directly from your RO/DI with no reservoir needed but you would need almost a day to allow it to fill unless you have a super duper RO/DI unit.
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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