Since 1932, the name ANTHRAFILT has been synonymous with the highest standard.  ANTHRAFILT is the world's finest filter media, and it is produced exclusively by CARBON SALES, INC.  Although its potential for water treatment was recognized in ancient times, anthracite coal was not used for that purpose until the beginning of this century.  Initial experiments using fine coal particles indicated that many improvements in water quality might be realized through the use of uniformly sized grains of anthracite as filtration media. 

There have been many technological changes since those early experiments.  Today ANTHRAFILT is prepared from anthracite coal extracted from selected veins using draglines of up to 85 cubic yard capacity.  This anthracite is then crushed in preparation plants.  Extraneous rock and dirt are removed.  The coal which remains is separated into various standard burning and metallurgical sizes. That anthracite which is destined for water filtration is further refined in CARBON SALES' own filter media plant to customer specifications. 

At CARBON SALES, INC., we consider our Quality Control standards second to none.  All potential coals from preparation plants are routinely tested for Specific Gravity, Acid Solubility, and Grain Size Distribution prior to acceptance for shipment to the processing plant.  Upon arrival, this anthracite is sampled and tested again before beginning even the first of a series of processes which will create ANTHRAFILT.  In order to maintain the quality of a very wide range of specifications, sampling and testing must continue through each step of the ANTHRAFILT sizing process.  Composite samples are collected and tested continuously by laboratory personnel. 

Each production run of ANTHRAFILT is checked again at our packaging plant.  Samples are extracted and composited into lot groupings and tested for size.  Random lots are chosen for complete analysis of Effective Size, Uniformity Coefficient, Specific Gravity, Acid Solubility, and MOH hardness.  The large number of analyses completed each day, (we manufacture more than 300 specifications), and the record keeping that accompanies them are computer controlled.  After each order is shipped, these recorded analyses are maintained permanently.  We have also expanded the computer function to the sales branch of the company so that we can offer customers fast and accurate projections as to the availability of specific sizes for future requirements.