Matt, If you're on a well, it is important that you get a membrane designed for that use... otherwise, you will end up replacing the most expensive element on a too-frequent basis. I would also suggest that whatever size you THINK you want, you get a size larger. Most units will produce more product water than advertised when new (or with new cartridges), but then will spend considerable time producing less than that. And, you may well find that new aquaria have colonized some new corner of your house down the road, which will necessitate more water. I am happy with and highly recommend Spectra-Pure in AZ... great product, excellent customer support. I have no affiliation with the company, but you could tell 'em I said, "Hi!" Martha ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader