The AL-60 measures about 8" x 6 3/4" by 8 1/2" tall
Weighs a little less than 14 pounds.
Below is the performance curve for the AL-60.
Koi will do much better, grow faster, and are just generally better off if you provide them with a high oxygen level in the water.
In order to do this I am installing a Alita air pump and a 12" diameter air diffuser directly over my bottom drain. An extra advantage to having a column of air located over the bottom drain is that the increased water circulation will draw debris across the bottom of the pond and into the drain. This results in the bottom of the pond staying clean all the time! Koi really do better in a clean pond and the air pump does all the work!
The AL-60 measures about 8" x 6 3/4" by 8 1/2" tall
Weighs a little less than 14 pounds.
Alita carries a line of air and water pumps, check out Alita's web site.