RLewis :

Before you start an aeration project for the first time in the south during summer [hot weather} please read the thread below esp. Bill Cody's posts. You need to know your pond well before you start or you may have bad results with DO levels. Research the topic well and understand before you start aeration. Unless you have a DO problem now look into using a fountain or sprayer as opposed to a bottom diffuser untill the water temps. drop some in the fall. ewest

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=20;t=001851