I use one of the cheap 10 GPD RO units. It actually gives me more than 10 Gals per day. I have about 30 tanks and it is actually plenty. I am on my 4th membrane in 3 years. At 79 dollars I find it hard to believe someone who wants one cannot find the dinero. That fish place if you can't find anyplace else. The replacement membrane is about 40 bucks I think. I know some people use rain water instead. That's pretty cheap and cleaner than the acid-rain-scare-tactic folks claim. Actually I plan to get a bigger unit when the membrane goes again and I do feel a bit of guilt about the waste water - but my fish don't. I would like to hear about folks experience with deionizers but most people I have talked to say they are not worth the trouble. Rebuttal? ------------------------------------------------------------------------- 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. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!