Ok I am using advanced nutrients sensi bloom in a nft system. It is suppose to be ph perfect which I do not understand from what I am use to in peat moss. When I do a fresh change ph is around 6.0-6.3. Now after about 24 - 36 hours the ph is going up to around 6.5-6.8 which I know is not right. Can anyone help me understand what is going on, or help me figure out what I am doing wrong.
Are you using tap water? My ph shot up like that daily when I started with tap. Use ph down to your desired ph, done. Monitor every 24hrs and adjust as necessary. http://forum.grasscity.com/index.php?/topic/1354378-hddani%27s-Journey-to-a-Harvest