"There were some guys who worked in between our 2 ponds in our apartment complex and when they left there were 2 boxes? ( zoom into first picture, it’s towards the top of the picture). I also noticed there’s a disturbance In the water in two different places (second picture) . What’s goin on?"
"Aerator. Helps keep the water column from becoming anoxic. “Pond Hawk” is one type powered by solar."
...film container. No mine has this particular imprint on the housing. For pressure you install AP or frog type device under, and pressurize with AT.
They are used all over to prevent damage to ships in general.
We use yokohama fenders while repairing the regular fenders on the jetty.