Most do just fine without, because they breath from the surface.
No, a filter should do.
Freshwater snails do not need a filter, but they prefer it. The more water movement, the cleaner they/their shell stays. I have 3 mystery snails in a 10 gallon and 2.5 gallon tank with a filter and they're doing very well, but I also have 5 baby mystery snails in an ice cream pail until they fully mature. They're doing well, too.
water
fresh water
Fresh water
Ya
In the aquarium were water, weed, sunfish, snails, and a neon fish.
Garden snails do not drink salt water, but they will drink water. Garden snails will drink any water that crosses their path. Snails can not drink salt water because it dries out and shrivels up their skin.
Garden snails need water for sure! Or else the poor things will dry up. Though they will shrink into their shells for protection, they can't do that forever. Sooner or later, they would starve to death if they don't dry to death. But garden snails cannot literally swim in water, so I don't suggest to put garden snails in large quantities of water.
a water filter or filter paper
Yes, Mosquitos lay there eggs in water and there larva live in water, Fish need water to survive and pond snails can also thrive in water.
water if they are lake snails use lake water, they also need a closed environment and rocks or sand but i would use rocks. They will also need plants and algae or frozen foods for their valanced diet!!!!!!!!!!!GOSH!!!!!!!!