Eheim torfpelletsr chemically acting filter peat lowers the ph value and reduces the water hardnessr comes complete with media bagr eheim torf pellets consist of specially treated acidic peatr it is rich in valuable substances such as humic acids and trace elements therefore do not wash itr peat pellets lower acidify the ph value of the water and so reduce the water hardnessr the pellets should however only be used if the ph value necessary for the particular type of fish is exceeded