"Mosquito Dunks" for Ponds

For Mother's Day, my son gave me and 6'x10' pond for my small back yard. After a short while, my daughter noticed a slew of mosquito 'tadpole' like larva swimming to the surface. I called a local nursery and they told me that they carry a product called "mosquito Dunks". I crumpled one up (Don't know if you're suppose to crumple or not), but after doing that and turning on the pond pump, my pond was not only rid of the mosquito larva (day or two for all) but the pond cleared up as well. If anyone is interested, they come six to a packet. (NO...I do NOT sell them).
Thank you.

By Mary