It’s the obvious answer but not always easy to implement. Visit upstream large potential fat producers and implement source control..
Otherwise, at the pump station start with random drawdown to avoid fat accumulation on the walls and floats.
Add fonctions on the sensors if not present
In some cases, we add gross aeration to break the surface crusts or high pressure washing.
Signed Pascal Lacour
The chemical route does not appear to be the best one in the case of domestic effluent, however mechanical mixing can produce the desired effect if coupled with a specially designed tank bottom and I recommend Flygt’s TOP line with mix-flush valves on the pump. Don’t mess around with the basin yourself because you can cause cavitation problems and significantly diminish pump life in larger wastewater installations. You can also install agitators but watch out for the fibers.
One idea that has never been tested on a life-size tank but perhaps deserves to be: spray the pump station walls and equipment with a non-stick, water-repellent product such as Ultra Ever Dry. See the Internet videos and this link: http://ultraeverdry-tap.com/