Join Date: Jul 2013
Location: Gainesville, FL
Received a EZ TDS meter, not to use for my aquarium but it was fun to play with...
Tap is 195 ppm. Tank is around 300-310 ppm, but I've just started fert dosing.
And just as a general warning to others...
If you get RO from your LFS, for whatever reason (I use it for carnivorous plants, not fish, which is why I bought the TDS meter), don't always trust them. I tested the 5 gallons I bought and it keeps registering at 210 ppm! So worse than my tap in that regard.
Granted, it's only a $20 meter so nothing very scientific...but scary to say the least. Not sure if their membranes are exhausted and I just caught it at the wrong time or what but I hate to think what issues that could cause to people who don't catch the problem.