I to have noticed that when you let tap water out the ppm climbs. also which is better cal-meg or magic-cal. I use ro water it comes out at 0 ppm and I use magic-cal but the plants act like they don't get enough I use the least amount that it says on the bottle should I go full strength sense my watter is at 0 ppm
Rubberbubbler Reviewed by Rubberbubbler on . tap water ppm question tested some fresh tap water straight out of the faucet, ppm = 55. tried testing some tap water that has been sitting in a plastic bin for about 3 days, ppm = 75. does this make sense? shouldn't the ppm be going DOWN as chlorine and other chemicals evaporate from the water? also, considering it's city water, shouldn't the ppm be higher? read a lot of threads with people saying their water was a few hundred ppm straight out of the tap. will calmag plus be needed?? thanks! Rating: 5