As I'd hoped, tossing chicken bones and a few handfuls of limestone chicken grit into my scavenged dinghy duckweed pond has caused an explosion of brown pond snails...daily I take out of the pond 3 submerged five gallon buckets that have great number of snails clinging to them and set them in the chicken path for the flock to feast on. They also relish the hot water cabomba aquatic plants I toss into the path, plus the duckweed I easily scoop out with a colander.