Yes, we do aerate. The previous owner installed it just before we purchased the property in 2014. I don't know the brand of the pump but that's on my list of projects to take it apart to see if it needs to be rebuilt. Last year I replaced the diffuser with a disk type. This year I will be adding another diffuser. The pond was in pretty bad shape. It was dug in the late 80's and had a lot of trees and shrubs around it so there was a significant amount of organic muck and FA. I have since removed most of the trees that have been adding leaf litter to the pond. This year will be my third in adding tilapia to help clean it up.

btw... Awesome looking place!!!!