4 dkh solution help


Junior Poster
Jan 15, 2008
Does anyone have any suggestions for a simple 4dKH solution? I have come across a number of links but it seems they either require scientific scales for the quantities to be accurate ( which I would rather not spend to come up with the teaspoon or so of actual solution) or they are amped up so that I am not measuring in tenths of a gram....but they are for very large ( it seems) quantities. Any help or suggestions woudl be greatly appreciated.


Lifetime Charter Member
Lifetime Member
Jan 24, 2005
Sacramento, CA
1. Go to your local grocery store. Buy the smallest box of Arm and Hammer Baking Soda you can get. Buy a gallon of distilled or deionized water. Total cost = about $2.00.

2. Clean a glass or plastic measuring cup with distilled water. Fill it with distilled water.

3. Use a flat toothpick to scoop a tiny bit of baking soda and add it to the water. Stir with a clean plastic spoon or stir stick.

4. Use your KH test kit to measure the KH of that water. It will probably be 20-100 dKH. If it is more than 20 dKH, pour out about 3/4 of it and add more distilled water to fill the cup. Stir again and remeasure the KH.

5. The measured dKH is "K". Do the following calculation:

V = amount of "K" water to add to a cup minus V of distilled water to get a mixture which is 4 dKH.
V = [K - 4] divided by K

6. Pour out all but V of the K dKH water. Fill the cup the rest of the way with more distilled water. It will work best to use a bit more of the "K" dKH water than the calculated amount.

7. Measure the KH of that water. It should be 4 dKH. If it is more than 4, add a little more distilled water. Repeat until you get 4 dKH.