Ingredients
15% Oyster Shell
40% Hemp
15% Oats
10% Chicken Mash (cereal mix for laying hens)
10% Sunflower Kernels
10% Pumpkin Seed
Oyster shell apparently is the best form of calcium but you can used crushed cuttlefish, and possibly lime flour (though I have no experience of this). It is known that a diet of 12% calcium is optimal for snails, the 15% represents the fact that not all will be absorbed and the fact that I don't feed this all the time.
The hemp is incredibly nutritious. I could list so many things I wrote a page about just that:
http://www.petsnails.co.uk/documents/hempseed.html
But primarly it is good source of phosphorus, fibre and edestrine, the easiest digestable protein and a good substitute for meat protein (which there is some evidence to suggest they may need at least some of).
The chicken mash, oats, sunflower kernels were added to ensure a good spread of carbohydrates, phosphorus and minerals between each of the seeds.
The pumpkin seeds have the same benefits but have small quantities of a known deworming agent. My snails love it and I've never heard of any ill-effects. I have no idea whether it is effective at deworming snails, but I figured it was an extra bonus on top of the great nutritional value.
Preparation
Mix with water. Leave it for a few minutes to finishing absorbing the water and then add more water, if necessary, to make a thick liquid.
I occasionally add a drop of vitamins to the mix and sometimes, if I have a snail I suspect is under the weather, I also sometimes make it with cold green tea (Camellia sinensis) because of its anti-viral, anti-bacterial and immune-boosting properties.
Feeding
At most I feed it 2-3 times a week, at the moment with fresh fruit and vegetables so in abundance I am feeding it once every 1-2 weeks.
I place it in the tanks in the evening and remove the day after, because it will start to smell after 24 hours. I've noticed my snails actually like this, particularly sour oats on the odd occasion it was left in longer but it isn't nice to deal with.
Don't feed too much in one go, they tend to eat it very greedily but excessive reliance on it, will make them less interested in it. Mine still enjoy it now, because I learned to give it as a regular treat and nutrition boost rather than a staple diet.
All the species I keep, except 1 will eat it. Also, I feed other mixes and some of the ingredients on their own to keep it interesting for them.
Wenn mal jemand Zeit hat und gut Englisch kann, darf es gerne übersetzt werden - schickt es dann einfach per PN an mich.