Some types of leeches are natural inhabitants of freshwater. Since ponds are freshwater it is not uncommon for freshwater leeches to be found in them. Leeches lay eggs and can also travel on their host to get to different bodies of water.
leaches get in your pool because that the pool is dirty or has some type of algee
you put them in your pond the same way you put them in your fishbowl
you could drain the pool, but if you don't want to drain your pool, you could get a pool skimmer and get all of the leaches out of your pool and then carry the leaches to a near by sewer, or a murky pond/lake/river.
go on the internetfind out what you needgo buy the stuff you needgo kill the leaches
No they do not
No, leaches are from Phylum Annelida and Class Hirudinea, which is completely separate from Phylum Mollusca.
No
leaches
yes
yes
No, they are invertebrate creatures.
Yes, blood.
They thought there were "vapers" in the blood so they used leaches to remove them.
They get brittle