# Re: [APD] Need Help to Test my Test Kit

```Ok, here's my calculation:
KNO3 = 1.069 gm/ml
K = 39% of KNO3
1 gal H2O = 3.77 liter = 3770 grams
20ppm = 20/1000000 =2 x 10-5
2 x 10-5 x 3770 gms (H2O) = .0754 gms (K)
.0754/.39 = .1933 gms KNO3
.1933/1.069 = .181 ml of KNO3
1 tsp = 4.93 ml
.181/4.93 = .037 tsp KNO3, which is a little more than 1/32 of a tsp.
Therefore:  about 1/32 tsp of KNO3 (from Greg Watson) in a gallon of
distilled water will give about a 20 ppm solution. (Actually, it gives
17 ppm, if you could measure 1/32 accurately.)

Who wants to correct my errors?

Vaughn H.

On Friday, October 21, 2005, at 06:18 PM, Charlie wrote:

>
> Can anyone offer advice on preparing a control sample to test my K
> test kit?
> I know many of you are familiar with Seachem Flourish. I'm trying to
> amount of Flourish or other suggested source of K to a gallon of
> distilled
> water to create a sample that should test at 20 ppm.
> Chas.
>
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