I am bringing up a new Water Farm... While I wait for babies to arrive, I am just recirculating plain RO water in the WF. The media is 50/50 Hydroton/Higromite. The RO water went in at about pH 6.3, but keeps climbing. I have added pH down to it an oz at a time on several occasions over the past couple of weeks, knocking it back, but only for a while. I did rinse and soak the media quite well before loading it into the WF, and I ran it for a few days on plain tap water, then flushed and ran some bleach water for a day or two, then tap water again for a few days, then went to RO and started montoring pH, which continues to return to high levels (7+). I'm thinking this may be a normal thing for new media. Can I expect the media to ever neutralize? Am I in error to believe that the media should not affect the pH in this way?