Something eating the slug pellets

I have recently been using some blue slug pellets which contain Ferric Sulphate. This seems to work as far as plant eating is concerned, but something seems to be eating the pellets as fast as I put them down.
No other ingredients are listed on the packet but so many are going that something larger than slugs must be eating them. It is only supposed to repel slugs anyway by drying up their mucus. I can't see what is attractive about them and can't think that an ingestion of so much iron is going to do any small creature very much good at all!
Anyone else got this problem? :rolleyes:

 

maybe you have a cat that thinks their tasty?! i know my cat eats just about anything she can, but i guess it wouldnt be good for them!!

 

Do you/your neighbours have a pet dog? I read somewhere that slug pellets are made from the same stuff as dog biscuits, but soaked in poison, sounds strange I know. Also, it's common for hedgehogs to eat them.

 

Liz, I'm no chemist, but isn't ferric sulphate the same as iron sulphate, and as far as I know thats used for killing moss in lawns.
Slug pellets used to contain metaldehyde, I think, as the killing agent.
I remember once buying a slug killer based on aluminium sulphate, but it was in crystal form, not pellets.
Its all off the top of my head so I could well be wrong.

 

Pete, you are right as usual, it is ferric phosphate. I don't use the metaldehyde ones because of the danger to other creatures.
My greenhouse is securely closed at night, which is when the pellets disappear. could be a rodent burrowing in, I suppose, I am just puzzled by the apparent lack of food value. Also most of theplants treated are high up where thedogs couldn't get them and the cats would nock everything flying.