...or cut down on the feeding. Snail infestation means they've got a lot of food. If they don't get a lot of food, they die off.
I've never minded having snails in my tanks, at least not after I realized that simply squishing or removing dozens at a time seemed to do nothing to the overall population, as viewed 24 hours later (I just gave up on caring, and have been much happier since!). But I have noticed that the (visible) population fluctuates wildly. Specifically, I get snail outbreaks within weeks of remembering to feed daily for a couple weeks straight (ironic, I suppose?). Especially sinking wafers.