Question with regards to my test kit. When I am testing my Nitrates, and hold the test tube up to the color chart, do you hold the test tube "against" the white background of the card? or do hold the test tube just "in front" of the white background of the card?
Beleive it or not, there is a big color difference. Im trying to figure out if my Nitrates are at a level of 20 or 60?
Told ya it is a simple/stupid question.......
Beleive it or not, there is a big color difference. Im trying to figure out if my Nitrates are at a level of 20 or 60?
Told ya it is a simple/stupid question.......