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Gravity Operated Slow Sand Filters

Gravity Biosand slow sand models are perfect for remote settings with no access to electrical power, such as cottages, camps, and rural area residences. They are also used for disaster relief and in developing nations. See our photo gallery to various pictures of Biosand installations.

These systems can be as simple to operate as manually pouring water in, or can also be hooked up to a well or pumping system.

Slow sand filtration is a biological process that cleans water much the way the sandy bed of a river cleans and recharges an aquifer. A column of water passes through a layer of fine sand at the rate of 0.1 gallons (0.38 liters) per minute per square foot or less. On the top of the sand, an intense layer of microbes naturally develops. This layer lives by consuming whatever is passing through in the water. In a slow sand filter, this layer, called the schmutzdecke, is responsible for removing up to 99.99% of all bacteria, viruses, Giardia, Cryptosporidium, and parasites through predation. As the water passes through the deeper layers, other processes such as sedimentation, mechanical filtration, and electrical attraction remove still more. The result is that slow sand filters may be the best stand alone water filters known.

Approved EPA Technology and required no electricity or chemicals

BioSand Filters will remove:

  • Parasites including Giardia and Cryptosporidium
  • Bacteria including fecal coliforms
  • Virus
  • Iron (and Iron Bacteria)
  • Manganese
  • Methane

 

  • H2S and other gases
  • Turbidity
  • Colour
  • Foul Taste
  • Odour
  • Toxins

Geofabric SSFx/1800 – Ideal for remote locations or overseas shipping

 

The patented and highly acclaimed SSF/x provides up to 1800 gallons per day, more than enough for most families. This filter provides all the features of our larger filters, including long filter runs, easy harrowing cleaning, and simple flow control. These features make it possible for any homeowner to install, operate and maintain a slow sand filter without expensive ongoing material costs.

This unit is especially designed for remote locations and international shipping due to its extremely small and lightweight packaging. It is shipped in a small box and unfolded on site. Two complete units can be shipped on one pallet – including media.

 

 

Small and Medium Sized Sand Filters

The SSF/x (0.3 GPM or 450 GPD) and the SSF/x-1800 (1.25 GPM or 1800 GPD) slow sand filters are ideally suited to individual cabins or very small user groups. This filter provides all the features of our larger filters, including long filter runs, easy harrowing cleaning, and simple flow control. These features make it possible for any homeowner to install, operate and maintain a slow sand filter without expensive ongoing material costs.

Large Sand Filters

Slow sand filtration offers a cost-effective approach to water treatment where surface water is the source and bacteria, Giardia, Cryptosporidium and turbidity are the problems. Small-community sized slow sand filters producing from 1800 gpd to 14,400 gpd and up, using extra heavy-duty polyethylene roto-moulded components. Additional output can be achieved through installing multiple units in parallel. These units can be installed in a matter of days without specialized tools or equipment at a fraction of the cost of concrete or steel. This means additional savings in that installation can accomplished “in-house” without costly out-sourcing for skilled labor.  

Contact us for pricing.