Before An After Pictures!

[Themuleous]

Without sounding patronising, are you sure you're doing the test right, I know I often get it wrong despite it being the 1000th time ive done an NO3 test!

 

[CBBP]

Without sounding patronising, are you sure you're doing the test right, I know I often get it wrong despite it being the 1000th time ive done an NO3 test!

Yes I do it the exact way it says on the back of the cards.