Based on the current knowledge about this natural material and on
studies dealing with the removal of dissolved manganese from water
using oxidation films formed on the surface of different filtration
materials, we performed experiments with the zeolite from Nižný
Hrabovec and natural material based on natural zeolite, where the
surface is also activated by black manganese. The surface of zeolite
from Nižný Hrabovec is activated industrially, and its trade name is
Klinopur. The second material is imported from abroad under the
trade name of Birm. The costs of Birm are almost threetimes higher
than that of Klinopur. Birm is used for the removal of dissolved
manganese and iron from water at small water treatment plants that
treat water from local resources.
The parameters of the selected filtration materials are shown in
Table 3.