I think some dewormers with (in)correct dose also eradicate snails? Like fenbendazole, praziquantel or something.
At least you can keep your biofilter intact that way,
but you'll have to deal with those dead snails and later, ammonia spike I guess.
If you have no other invertebrates in the tank, copper based chemical (snail-rid etc.) is the surer way to go though.