Dosing system KG200-S for Diatomite from a Flexcontainer. The dosing unit for the diatomite is flanged dust-free to the slide exit valve of the Flexcontainer and the dosing performance is adjusted at the controller. With the start of the aggradation water respectively the liquid to be filtrated is flushed through the suspension unit. The dosed diatomite is suspended here and conveyed to the filter.