Rule of thumb for anthracite ...
Published by James Stewart
Rule of thumb for anthracite media: 10 gpm/ft2 cold water, up to 15 gpm/ft2, hot water (lower viscosity. Sand filters may be back-washed at the higher of the two numbers. In your case, use the lower of the two back-wash rates, expand the anthracite portion about 30-40%. Your filter probably is designed with 100% free-board (half the vessel is just water) to allow for expansion during back-wash.
1 Comment
Thank you for your valuable comment. Here, what is meanby gpm/ft2 ?
Published by Asanka Wimalarathne, Area Manager at Wasser Kraft Tech (SUEZ - Water Technologies & Solutions Channel Partner)
1 Comment
gallons per minute per square foot, SI equivalence: 1 gpm/ft2 = (velocity) 0.1337 ft/min, thus we have 0.0407 m/min. Good velocity for typical media will be 0.41 m/min.
Published by James Stewart