Thirty years of humidity can lead to a lot of rust.

That’s certainly the case for a pair of tower-like aeration devices and their structural steel supports at the Bluewater Anglers’ fish hatchery, built 30 years ago in Point Edward.

The twin towers, that oxygenate well water as it trickles through a series of drums, are critical for the hatchery’s role in rearing some 150,000 fish every year for release into the Lake Huron water system, said the not-for-profit’s Brad Armstrong.