The Greywater filters have one main function, that is to remove all the large particles (hair, lint) from the greywater.
They have two sections; the filter tank and the surge tank.
The filter tank holds the filter.
The surge tank temporarily holds the water.
It’s important to use a surge tank opposed to a holding tank because a holding tanks requires inspections and a higher priced permit.
A surge tank does not require inspections and the permits are sometimes free or very low priced