Dual-Media Filter Backwash and Headloss Calculator  
  Copyright WQTS, Inc. ©2019.  All Rights Reserved   Ver. 2.0
  By using this calculator, You, the user, understand and agree that 1) WQTS makes no warranties of the accuracy of its calculations, 2) you use it at your own risk, and 3) you indemnify WQTS, its owners, employees, and agents from any and all damages, costs, harm, penalties, injuries, claims, or loss, financial or otherwise, resulting from, or in any way related to, Your use of this calculator.
  (1) - Input Known Conditions:    
  Temperature = oC
  Filtration Rate = gpm/sf
  Acceptable Diff. in Opt. BW Rate between Media =  
  (2) - Input Filter Media Properties: Layer #1 Layer #2
  Depth, inches =
  Effective Size, mm =
  Uniformity Coefficient =
  Specific Gravity =
  Assumed Porosity =
  Assumed Sphericity =
  (3) - Read Individual Layer Properties: Layer #1 Layer #2
  d60, mm =
  Clean Media Headloss, in =
  Clean Media Headloss, ft =
  Clean Media Headloss, psi =
  L/D Ratio =
  Opt. High Wash Velocity, gpm/sqft =
  Minimum Fluidization Velocity, gpm/sqft =
  (4) - Read Overall Calculated Values for the Filter:  
  Clean Media Headloss = inches
  L/D Ratio =  
  Are the Media Matched ?
  Optimum High Backwash Rate = gpm/sf
  Minimum Fluidization Velocity = gpm/sf
  Message Board: