Idea for ridding snails for good.

Ok so after my research Alum kils snails period..at least at high enough doses...and doesnt harm plants.. I have an 80 gallon planted aquarium with plants and snails only. My question is if i treated my aquarium as a whole now will i be able to get the alum out to make it safe for shrimp and fish and never worry about snails again.. PS i already purchases 25 pounds of alum in bulk online it was only 30 bucks. let me know what you think and ways to get it back out of my system