Hey guys, I am not totally new to TDS/PH readings, but I read somewhere awhile back about what it means when your ppm and pH fluctuates. I think I read that generally when your ppm fluctuates it could mean that either your water in the reservoir is evaporating or your plants are using up the nutrients causing the ppm to rise and sink. Then there are fluctuations with pH. I forgot what it said about your pH fluctuating and would love it if someone can fill it in for me. Please feel free to chime in on this to let me know if this is correct, add in some information, or point me to a thread that explains this Thank you and stay high as a kite!