If you use a 25 ml sample instead of 10 ml then your precision will be 0.2 ppm. You will want to use two scoops of powder when doing the 25 ml test. However I agree with Marty, it's not necessary and you go through reagents more than twice as quickly.
The instructions for the 25 ml is to use 2 scoops, but it doesnt say how much of the powder to use for 10 ml. Ive just been using 2 scoops per 10 ml of water; have I been doing it wrong?
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