Well it works best if you can find the entrance to the voles den. It takes a bit longer to work if you cant find the den. Using it in the voles tunnels is second best.

So hard to tell whether this is working or not? Where I live there's voles everywhere and none of my neighbors do a thing about the voles in their property. Naturally the voles eventually end up on my property too! I think it's maybe killed a mole here or there? Least it seems the vole mounds in my garden are less or least seem to see little signs of the mounds every so often? Then I got vole mounds again in the garden when I think I got rid of them? Why I say it's hard to know for sure if it's helping or not? As I understand how it works it doesn't kill moles/voles immediately, it makes them dehydrated where they can't get enough water and eventually die.
It's a little time consuming and annoying to have to weigh out 5oz at a time and wrap it in clear plastic wrap in a ball basically and put that in the ground so that rain water doesn't ruin this product before the moles/voles eat it. But if it works I suppose it's worth the effort? I won't say anything more negative about the product other then having to measure it out and ball it up in plastic. Although if your sure it's not going to rain or need to water a area for a couple weeks or more? Then you might be able to delete wrapping with plastic wrap? I tried mole traps and only had some tiny success with those too! These underground creatures can drive you insane trying to get rid of them. But if your patient this product may actually work eventually given enough time for the moles/voles to keep eating it enough to eventually die off! I sure hope so anyway?

This seemed to take care of the voles and no harm has come to the neighborhood cats.

I live up in mountains, overrun with voles, moles, mice. I put it under my house, and few days later, population cut in half! Ill definitely buy more of this. Very happy 😊.

Did I say this works on Voles? I guess it does because we don't have as many. There are many less fresh vole tracks in the yard, gardens and everywhere. Great for a non poison vole reducer. Not a total eliminator so I buy these by the case and use them at the first sight of a fresh hole or path.