I haven't used ebb and flow but the only thing I can think of would be to give it some time and see if there's a bad effect on a plant. Then you have a problem. As it is, this may not be an issue. but then I don't ebb and flow, just my two cents. your results will depend on any changes you make, however. if none are made, perhaps there's something natural that you've overlooked.
polishpollack Reviewed by polishpollack on . ppm and ph rising I am in an ebb & grow 55 gal res. mid vegetative stage. My ppm is 1200 which includes my water which is 200. So my nute ppm is 1000. I am using House and Garden nutes my ph goes from 5.8 to 6.8 or 7.0 and my ppm goes up about 100-200 per day . What is going on? Rating: 5