What does filter-bed volume mean in practice?
Is the volume of the medium in its working state, excluding the free space needed to expand it during rinsing.
When does it matter?
The same mass of different deposits occupies a different volume and requires a different reverse velocity due to bulk density.
Which solutions are related to it?
The correct amount is measured according to the medium card, the required freeboard is left and the amount is saved for the head configuration.