Hydraid® BioSand Filter

The Hydraid® BioSand Water Filter is comprised of a plastic container that is filled with layers of sieved and washed sand and gravel. Water is poured into the top of the filter where it collects in a storage container. The water passes through the dif­fuser plate and the sand and gravel layers. Head pressure pushes water through the pipe in the base to the outlet point. Biological con­t­a­m­i­na­tion is reduced through the actions of adsorp­tion; mechan­i­cal fil­ter­ing, pre­da­tion (bio­log­i­cal layer) and nat­ural die off.

Height – 0.77 m (30.5″), Diameter – 0.42 m (16.5″);

Weight: Empty – 3.6kg (8 lbs.), Filled – 63.5kg (140 lbs.)

Construction materials: UV-resistant plastic, FDA-approved materials, no moving parts The external outlet pipe may be prone to damage and leakage.

Technical support is expected to be provided by the user.

Manufacturer estimates the lifecycle to be more than than 10 years.

In 2008, three health impact studies were performed specifically on the plastic Hydraid® BioSand Water Filter and involved 81 filters installed in Cambodian households, 89 in Honduran households and 115 in Ghanaian households.

In 2012 the health impact study on the plastic Hydraid® BioSand Water Filter showed greater or comparable reduction in diarrheal disease in comparison to trials of concrete biosand water filters in Cambodia, Kenya and the Dominican Republic.^{Link broken as of 2018}

Filters should not be moved after installation.