ppm rise

I bought a Hannah ppm ph meter, and I'm like a kid with a new toy. I check my water all the time, and it reads 26 ppm I set meter on 0.7. I think that's really good for tap water, from what I read on this forum. The problem is if I check a glass straight from tap it reads 26. The next day it will read over 200. I let a glass set for 3 days and it reads over 900 and that's with out adding anything. I mixed up a gallon of nutes last night and I wanted about 600 ppm and I got it close around 660. I checked it tonight, and it was over 1000. Why is my water doing this? Thanks

I would just check it strait from the tap, or when it is in your reservoir. No need to keep checking the same glass of water all day long.

I have a friend that second guesses everything he does. He puts his PH meter in a glass of reservoir water and it goes normal at first, then freaks out when it drifts really high over the next 16 or 20 hours. I tell him, dude just dip it in the reservoir for five minutes and go with what it says lol.

26 ppm is epic tap water, better than mine. Mine is mid 30s this time of year.

Probably algea or something is growing in the glass of water causing the ec to change.

wtf! my tap water is 250 ppm

I have a crazy idea. Those Hannah meters are crap.

Either that or you have mutant, alien tap water that spontaneously generates dissolved solids.