It is possible that some those with suspected gastro-esophageal reflux disease could also have symptoms related to continued reflux of non-acidic material. Non-acid reflux also plays a role for persistent esophageal symptoms. Acid reflux detected by pH monitoring that shows a reading below 4.0 is acidic, while one showing a pH reading above 4.0 is non-acidic reflux. To sum up GER episodes with a pH of 4.0 to 7.0 fall under the category of “weakly acidic” reflux, while GER with a pH above 7.0 would be considered “weakly alkaline”, with a reading below 4.0 being acidic reflux.