Sorry, won't work.

Mosquito dunks, BTI, would be the wrong thing to use if slugs were listed as targets of the BT spores. I see nothing that tells me that BTK, which is for leaf eaters, would be a control either.

It was said "BTK, which is for leaf eaters,"

Yes, Btk is for leafeaters. But a specific kind of leafeater -- caterpillars.

To keep slugs out of your garden try iron phosphate (brand name Sluggo or Escargo). It is organic and the slugs prefer to eat it even more than hostas! It then kills the slugs (stops up their digestive tract). And it will not harm animals that eat those slugs (like frogs and toads).

It was said "The BTK 'worm killer' is a bacteria which changes the caterpillar's stomach pH to a point where it can't digest food."

Not quite so.

Here's part of the info from Colorado STate abaout the various forms of BT:
"Btk a"Unlike typical nerve-poison insecticides, Bt acts by producing proteins (delta-endotoxin, the "toxic crystal") that reacts with the cells of the gut lining of susceptible insects. These Bt proteins paralyze the digestive system, and the infected insect stops feeding within hours. Bt-affected insects generally die from starvation, which can take several days."

The entire article is at http://www.ext.colostate.edu/pubs/Insect/05556.html.

Here is a link that might be useful: Facts re the various forms of Bacillus thuringiensis

Bury a soup can so the top is flush with the ground and fill it up half way with beer. The slugs can't resist it. I don't even buy bait anymore.

I'm not sure where this notion about Bt and pH is coming from. Bt kills insects through Cry toxins. Each type of Cry toxin affects only a limited range of insects -- hence the wide variety of targeted Bt species. They work by bonding with the cell membranes of the digestive system -- if and only if those membranes have a proper receptor -- and creating large pores in them (so-called "pore-forming toxins"). This lets the cell contents leak out and other stuff to leak in.

BTK will only work on Lepidoptera (moths and butterflies) and will not work on anything else, sorry.