Potters Without Borders

Ceramic Pot Filters treat water borne disease.

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Problems with Mold Release

Problems with Mold Release

Ceramic water filters are typically cast-formed utilizing aluminum, steel or sometimes concrete molds. The wet mix or charge is placed in or over the molds and the male and female are forced together under pressure to form the shape. Two plastic bags on the inside and outside of the form act as separators that allow the new filter to be easily and cleanly released from the molds. Since developi...
Material input variables

Material input variables

Fine Vs. Coarse sawdust What is the relationship between fine and coarse sawdust on filter strength?   1. Compare filters of gradually increasing amounts of fine, and then coarse, sawdust. Compare strength of filters of similar flow rate. 2. Refire low flow rate filters to attempt to equalize the flow rates, then Compare strength of filters of similar flow rate. (Hypothesis is that firing for...
Development of appropriate mixers

Development of appropriate mixers

Developing appropriate processing mixers, pug mills , or hybrid machines for ceramic water filter factories. Ceramic pot filters that produce potable water are made from a mixture of clay and combustible materials, usually sawdust or rice husk. Both the clay and the combustible are crushed and screened, dry blended, and then wet mixed before forming. Factories employ simple paddle mixers and in so...
Affordable presence absence testing

Affordable presence absence testing

Fired filters are currently being assessed by factories using three tests. Filters are dunk tested to identify cracks that allow water to leak through the filter more quickly. If they pass that test they are then soaked and flow tested. After flow testing, water from some filters may be challenge tested to see if they actually remove bact...
Kiln Setting

Kiln Setting

Here we are in the workshop doing more work on the computer than on the workbench, but its nice to have the specs to share. There has been some work done on designing a special kiln setting to fit more filters into a kiln-load. The ones in the photos below have been made with the same mix as the filter-body. They are functional, but we wanted to see if we could make them less massive without loosi...

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