Currently my pump is broken and I am trying to replace it, but like you I need to treat the water or my neighbors will not like the mosquito farm =-).

I use two 1/4 horsepower submerged pumps with a rope around them so they "point" the direction I want the water to circulate in. I chlorinate regularly and shock once a week. I always premix the chlorine or shock with water in a large bucket before adding it to the pool, that way it integrates into the flow from the pumps better.