Water Gardening: I need some help with algea please, 1 by guspuppy

guspuppy wrote:
I have a water garden, about 4x12?, hubby knows and he isn't here right now. The ice on the top has all melted, and there is a ton of the string algea in it. Now, to put the pump together,(we sink it to the bottom of the pond for the winter) I need to get 'IN' the pond, brrrrrrr. I usually do this after the water warms but I have never had this much algea as soon as the ice is off. I know I need to run the pump and filter when I kill the algea so it gets sucked out, is there any product that will kill it off and make it sink to the bottom so that it doesn't interfere with the breathing of the fish?
Thank you,
Kathy