I'd use RO or distilled water. Solved the problem for me. I second the 5.1 being too low--IMOT
Weedhound Reviewed by Weedhound on . Why isnt my PH level more stable? Well I lower it and it jumps a whole point by the end of the day. Ive been trying to get it down to about 5.1-5.8 and it seems everytime I check it goes futher up lol. Is this normal? Its only an 8 gallon res and Im just starting and Im unsure why this is happening. My Journal http://boards.cannabis.com/showthread.php?t=89797 Rating: 5