Pre Mixing Kalk?

[tigé21v]

We'll be heading out of town for a couple of weeks. Chances are, my 30 gallon kalk reservoir should be enough till we get back. But, in case it isn't, I'd like to make it as easy as possible for the tank sitter to mix up another batch.
Can I mix up a "slurry" right before we leave? Say, 2 1/2 cups to a gallon of water, and seal the container containing the slurry. If another batch is needed, the sitter could add the gallon of slurry to 29 gallons of RO water.
Would the new batch of kalk made with the slurry be as potent after the slurry has sitting on the shelf for a week or two?

 

[Hitman]

Not sure if this helps but when I’ve gone on vacation I measure out the exact amount of powder I use for my 25 resivoer and put it in a ziplock bag with written instructions on how and how long to mix it with the rodi water for my tank sitter. So far there has been no issues.

 

[tigé21v]

I'm sure the person would be able to do it, but more than anything I want to isolate the person from possibly breathing in the kalk dust you inevitably get while mixing it up.