I've a three and half year old pond and is mature now with lots of
plants, lillies and fish. The water is great and clear. Currently I've
noticed that it has tonns of snails. I do not know where they come
from. I even noticed a lot of 'em in skimmer net and am also worried it
might get into the pump in the skimmer. How do I contro l these? Any
help?

Thanks,

AJ