A filter tank, usually fiberglass or ABS plastic, filled with sand and gravel. The pump diffuses water over the top of the sand bed, and forces it through the sand and into the laterals on the bottom. To view our range of filters click here.

Self-contained beds of sand underlain with perforated underdrains. Runoff is filtered through the sand and is collected in the underdrain system and discharged to a receiving water or to another BMP for further treatment.

a tank-shaped filter that utilizes a special grade of sand, as a filter media. Not always the most effective: benefits from periodic use of water clarifying products. Common mistake is backwashing too often. The efficiency of a sand filter can be significantly improved by using a zeolite sand filter replacement media, in place of the filter sand.

A packed-bed filter of sand or other granular materials used to provide advanced secondary treatment of settled wastewater or septic tank effluent.

Type of filter using silica sand media for filtration, requires back washing.

an alternative type of septic system used to pretreat effluent discharged from a septic tank

a very low maintenance filter and a good backwash usually takes care of any problems

A specially designed bed of sand and gravel that pre-treats septic tank effluent prior to disposal in a leachfield.

A type of filter which uses silica sand as the media for filtering out dirty and other impurities.

A pool water filter that uses fine silica sand (not beach sand there is a difference) as its filtering agent.

A packed-bed filter of sand or othergranular materials used to provide advancedsecondary treatment of settled wastewater or septictank effluent. Sand/media filters consist of a lined(e.g., impervious PVC liner on sand bedding)excavation or structure filled with uniform washedsand that is placed over an underdrain system. Thewastewater is dosed onto the surface of the sandthrough a distribution network and allowed topercolate through the sand to the underdrainsystem, which collects the filter effluent for furtherprocessing or discharge.

A biological and physical wastewater treatment unit consisting (generally) of an underdrained bed of sand to which primary treated effluent is periodically applied. Filtrate collected by the underdrain(s) is then transferred from the filter to an approved soil absorption system or other treatment step. Pretreatment of wastewater prior to the sand filter step, can be provided by either a septic tank or another approved treatment device.

A pool water filter that uses a fine silica sand as its filter media.

Filter composed of layers of sand graded in particle size so that the coarser particles face the unfiltered flow. Commonly employed in filtration of water supplies. Filters of this type (perhaps incorporating crushed coke and grit) have occasionally been used for removal of particles from gases. See deep bed.

A water filter which uses fine silica sand as a filter media.

A filter that uses graded layers of sand as the filtration medium.

A filter using sand or sand and gravel as the filter medium. The oldest (patented in 1790) method of improving water quality, generally using two layers of sand supported by an underbed layer of gravel.

Device to remove suspended solids from water by passage through a bed of sand.

separates suspended solids and associated BOD/COD from liquids by passing the liquid through a bed of sand

The oldest and most basic filtration process, which generally uses two grades of sand (coarse and fine) for turbidity removal or as a first stage roughing filter or prefilter in more complex processing systems.

Pool filter using sand as filtering medium.

Sand filters are used for water purification.