It will be a year soon since I installed the pro series unit. It has worked great, we were leaching water constantly at the down side of the field, the odor was terrible. There are 14-16 people living here, mostly children, you could imagine the strain that would put on a good system. It is 20 years old and we did not want to replace it, found your web site when researching how septic fields work. Called and talked to a rep and decided to give it a try. Wow are we happy, it has cut the odor and almost all the leaching is gone. Thank you for a great product.