It would probably be lower than that if it weren't for the melted RW,kick it up to about 5.5-5.8,low ph locks out the major nutes,baking soda will raise it ,mix a few tbs in about 1 gal of water ,add it at night then check in the day,give it some time to assimilate in the reservoir,dont add it all at once,gradually over a few days,or repeat over several days till you get your target range...bonbon