Well I am looking for a rodi unit for my aquarium. Don't have a lot of knowledge about them and have some questions. What are differences between the different amount of stages? Also what's the maintenance on Ro units? Thanks guys and let me know if you have any for sale.
And how is this one?
http://item.mobileweb.ebay.com/view...scription&index=12&nav=SEARCH&nid=65954970246
And how is this one?
http://item.mobileweb.ebay.com/view...scription&index=12&nav=SEARCH&nid=65954970246
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