[bkw1982]

I recently made a drop checker out of a cough medicine cup and for the solution i mixed tap water with distilled water until i got a kh of 4. The drop checker started off dark blue, and after a couple hours truned green. My only concern is that i may be getting a false readings due to the tap water.

So can tap water screw up my readings?

Thanks
Brandon

 

[bkw1982]

I kinda figured as much, thanks.