I am looking to buy an RO/DI within the next few months and was wondering what was a good brand. I saw one on ebay for pretty cheap. Does anyone have an RO/DI for sale? Here is the one on ebay. Does that look any good? http://cgi.ebay.com/New-Reef-6st-100GPD-Reverse-Osmosis-RO-DI-Water-Filters_W0QQitemZ4448844134QQcategoryZ20684QQrdZ1QQcmdZViewItem