text: * If it takes more than five minutes to form 1/8 in. cake thicknesses, continuous filtration should not be attempted.
  * For negligible cake build up in clarification, cartridges, pre-coat drums, or sand filters are used for filtration
  *When the filtering surface is expected to be more than a few square meters, it is advisable to do laboratory tests to determine whether cake washing is critical. If there is a problem with the cake drying, filter precoating might be needed.
  * For finely ground ores and minerals, rotary drum filtration rates may be 1500 lb/(day)(sqft), at 20 rev/h and 18-25 inch Hg vacuum
  * Coarse solids and crystals may be filtered at rates of 6000 lb/ (day) (sqft) at 20 rev/h, 2-6 inch Hg vacuum. 
  * Surface areas in porous ceramics: Porous ceramics processed by a sol-gel technique have extremely large surface areas, ranging from 200 to 500 square meters per gram