Making a liquid solution from dry ferts

[An t-iasg]

I am dosing my 10 gallon tanks with Greg Watson's dry ferts. For my three 5-gallon tanks, it seems easier to dose with liquid solutions. A year or so ago, I bought Greg Watson's ferts already mixed at an lfs. Now I'm running out and I have to mix more. The labels on the liquid solutions I bought say:

"1 ml per 20 gallons = 1 ppm nitrate" or phosphate or potassium. I want to make this same concentration again since it's what I'm used to in my 5 gallon tanks and they are doing fine.

Here's what I found using Chuck Gadd's calculator. Can someone verify?

I put 20 gallons and 100 ml of water in the boxes, and played with the teaspoon amount until the "each ml of this solution will add" box said 1 ppm.

KNO3 - nitrate - 2.25 teaspoons per 100 ml of water gives 1.02 ppm nitrate.
KH2PO4 - phosphate - 2.25 teaspoons per 100 ml of water gives 1 ppm phosphate.
K2SO4 - potassium - 3 teaspoons per 100 ml of water gives 1.07 ppm potassium.

Does that look good? Is it really this easy? 8O

Edit: mixed up ml and ppm

 

[Lonewolfblue]

KNO3 - nitrate - 2.25 teaspoons per 100 ml of water gives .98ppm nitrate.
KH2PO4 - phosphate - 2.25 teaspoons per 100 ml of water gives 1.12ppm phosphate.
K2SO4 - potassium - 3 teaspoons per 100 mo of water gives .85ppm potassium.

This is using Chucks Calculator that I have on my PC, that I downloaded from Chucks site. Yes, it's that easy.

 

[An t-iasg]

Good! Thanks!

It seems like 2.25 teaspoons is a lot of dry fert powder to add in only 100 ml of water. At first I was putting only .25 teaspoons in the box, and the resulting solution was very weak. "1 ml = 1 ppm in 20 gallons" seems weak also, but it is what I want to end up with. The calculator made it easy to figure out!