Although I do not have to use my RO unit now, the real question is how much soft water do you need in a week. You can easily store 100 gallons in vinyl trash tubs and pump it into your tanks when doing a water change. I did this for several years and it wasn't a problem at all. Now I have tap water that has less than 1 degree hardness (GH and KH) so the unit is not needed. Joe Hildreth 15 Cedar Street Potsdam,NY 13676 ------------------------------------------------------------------------- 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"!