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Media Filters for Microirrigation

Agricultural Water

  1. Dorota Z. Haman

Published Online: 15 JUL 2005

DOI: 10.1002/047147844X.aw1511

Water Encyclopedia

Water Encyclopedia

How to Cite

Haman, D. Z. 2005. Media Filters for Microirrigation. Water Encyclopedia. 3:752–754.

Author Information

  1. University of Florida, Gainesville, Florida

Publication History

  1. Published Online: 15 JUL 2005


Media (sometimes called sand) filters are well suited for removal of either organic or inorganic particles. Due to their three-dimensional nature, media filters have the ability to entrap large amounts of contaminants. They do not seal off as easily and therefore will not clog as often as filters that trap particles on their surface, such as screen filters. Media filters consist of fine gravel and “sand” (that actually is crashed granite or silica) of selected sizes placed in pressurized tanks. The main body of the tank contains sand, which is the active filtering ingredient. The sand is placed on top of a thin layer of gravel that separates it from an outlet screen. Sharp-edged sand or crushed rocks are recommended for the filtering media since the corners catch soft algal tissue. Crushed granite or silica graded into specific sizes for a particular system are commonly used porous media. Media filters are cleaned by backwashing. This operation consists of reversing the direction of water flow in the tank. Automatic back flush systems will eliminate sudden changes in water quality that can create problems if a filter is washed only at regular intervals.


  • drip irrigation;
  • trickle irrigation;
  • micro irrigation;
  • filtration emitter;
  • clogging;
  • plugging;
  • irrigation water quality;
  • filtering media