If you are looking for an RO/DI system, The Aqua-Safe Pure Water Shop located on E-Bay, has the best prices on the Maximus II RO/DI system and other water purifying systems that can be effectively used for making your own salt water and/or drinking water. The system quickly pays for itself and you will find that it is one of the best investments towards your marine tank that you can make. They also carry the filter mediums that are used in the canisters. The shipping charges are reasonable considering the weight of the item and is shipped out right after payment. Their customer support, if you should need help in assembling the unit however, is slow in the coming. For overall value, shipping and customer service, I rate them a 4 Star.

eBay Store - The Aqua-Safe Pure Water Shop: Category 2, ACCESSORY ITEMS