Don't waste your time!
Snail has very strong living ablility, my painful experience was that I tried to use the snail-killing liquid/tablet (be careful! It kills the prawns and algea eaters very quickly, only fish can suffer the medicine), snail-catcher, used my hand to pick them out one by one (a tired job and do it daily), even washed the sand with concentrate bleach water, renew the whole tank water, they grow quickly again (maybe their eggs are tough enough to against it). It is just like the Alien, seems never die. I was totally collasped, my mind was once go or not go to have this hobby again! However, sences of beautiful grasses under water in fact attached me too much! I decided, fighted the battle!
Nothing can do more, last I replace all things, new tank, new sand, new water and new filter. After doing so, I took untra care to everything that is going to be put into the tank, especially the new grasses, I check carefully any snail adhered and immersed with snail-killing liquid for a night long!
Hope this gives you some ideas and I do hope you are no need to do what I did!!
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