Sand Filter

Sand filters are used as a step in the water treatment process of water purification.

There are three main types; rapid (gravity) sand filters, upward flow sand filters, and slow sand filters. All three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high-quality water with pathogens removal from 90% to >99% (depending on the strains), taste, and odor without the need for chemical aids. Sand filters can, apart from being used in water treatment plants, be used for water purification in singular households as they use materials that are available for most people.

Puritech filtration equipment features an excellent design with high-quality components to offer high performance. Puritech systems are designed for the longest life span with minimum energy consumption. Experience greater savings with lower maintenance and operation costs when you install Puritech filtration equipment.

The main benefit of a sand filter is the simple system which, in many cases, can be used to obtain considerable yields. A sand filter can be placed in various phases of water management – as a pre-treatment, as side-stream filtration and as a polishing filter. A sand filter often provides an effluent with potential for re-use.

However, chemicals sometimes need to be added to improve the yield of the sand filter. A disadvantage of sand filtration is the rinse water that is created when the sand filter is cleaned. This heavily polluted water must be treated and disposed of. To limit the load on the filter, a preliminary sedimentation step is implemented for heavily loaded wastewaters (a lot of suspended and sinkable matter). This helps to avoid repetitive re-rinsing of the filter.

Discontinuous sand filters are often placed in parallel set-up in order to keep the process running when one of the filters is being cleaned.

Product Description:

Impurities are removed from water by passing through a bed of quartzite sand of various gradations. The installation of a Sand filter is recommended when a load of turbidity (sand, lime, scales, colloids, etc.) of water is very high, affecting the water quality and resulting in deposits and encrustations on pipelines, boilers, taps, and on domestic and industrial appliances in general. Puritech Multi-Media depth filters typically remove particles 5-15 microns in size or larger. All media included in our filters are carefully selected according to particle size, so the media retains its stratification during backwash and rinse. An automatic backwashing system removes the trapped contaminants within the filter bed and washes them down the drain.

Advantages of A Sand Filter

  • Turbidity Removal
  • Low Maintenance Required
  • Automatic or Manual Control Valves are available
  • Designed to achieve High Flow Rate

Why use sand as filter media on the water filtration and how it works?

Sand has for a long time been used to clean as well as purify the water. 4 grades of sand are majorly used for water filtration all over the world.

Today, the provision of good quality potable water is taken for granted in much of the developed world. So, how exactly does it work? Natural sand has a sub-angular to the rounded shape, that does makes them ideal filtration media to be able to capture the suspended solids in the water. As a result of the high silica content, sand is durable and hard-wearing, which allows it to graded precisely so as to facilitate efficient filtering.

Sand gets to be laid on top of the supporting layer of the gravel within the filter vessel. Incoming water enters the filter and migrates through silica sand, hence successfully removing any solid or even debris from the water. As a result of its uniqueness in terms of its properties, the silica sand is usually used for water filtration in a wide variety of applications that do include swimming as well as leisure, paper processing, power generation, chemical processing, and portable as well as wastewater treatment.

In the market, there are various types that are available. The pressure filters are operated with a feed pressure of two to five bar and usually used in leisure applications. Feedwater does enter and passes through the bed of sand. The majority of particulate solids are usually captured high up in the filter beds, this kind of filter is able to capture even the small particles. The buildup of the particulate solids does cause an increase in pressure loss across the bed for a certain given flow rate. When this pressure loss or the flow rate is not the acceptable bed is back washed to be able to remove accumulated particles.


ModelMedia VolumeDesigned Flow RateControl ValveIn/OutletTank Dimension
MMF-103530 Liters5.5GPM17LPM5600FT3/4″10″ x 35″
MMF-105450 Liters6.6GPM25LPM5600FT3/4″10″ x 54″
MMF-135470 Liters11GPM42LPM5600FT3/4″13″ x 54″
MMF-1465100 Liters13.5GPM50LPMWS1-TC1″14″ x 65″
MMF-1665120 Liters20GPM75LPMWS1-TC1″16″ x 65″
MMF-1865150 Liters21.5GPM80LPM2850FT1-1/2″18″ x 65″
MMF-2162200 Liters24GPM92LPM2850FT1-1/2″21″ x 62″
MMF-2472300 Liters36GPM137LPM2850FT1-1/2″24″ x 72″
MMF-3672600 Liters71.5GPM270LPM1702″36″ x 72″
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