If you change and maintain the carbon and micron filters according to the manufacter's guidlines I have gotten water at about 6.5 consistantly after a day of settling. I have a tank under the sink for drinking water and a hose running to my garage for water for my reef tank. There are many factors involved Dave so it would realy be hard to make a hypothesis. Most notably your source of water. But I have used other brands and I firmly beleive the quality of the RO membrane itself is far superior in the Spectrapure brand. Call their tech support line for more details they are very helpfull. === David Sanchez Casselberry, FL http://www.mindspring.com/~barbax barbax2@yahoo.com _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!