That is exactly what I did with my discus pairs. THey started around 175 or so hardness on a TDS-1 (from ThreeGuysAquatics got a great price). I used straight RO to do water changes until I got the hardness in line. THe relationship with RO and tap mixing seems strange. For instance, water at 175 changed 50% with straight RO and the hardness did not get halved. Not gonna figure out the chemistry just wanted you to know what to expect. --- JerrCarol@aol.com wrote: > Hi All, > just curious, How does one get their water down to > a trace hardness without > adding strait RO? I heard adding strait RO was a bad > thing. My logic says > that if there is already 150ppm then adding strait > RO would bring it down. Is > my logic wrong? > > JerryB > __________________________________________________ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 ------------------------------------------------------------------------- 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.