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The filters consist mostly of the local clay. This is pounded into a fine powder by hand.
Clay, sawdust, and water are mixed together until a mass that can be shaped is created.
This mass is put into the filterpress, which gives these filters the necessary solidity and permanent shape.
Once the filter is shaped it is only cleaned at the rim. Excess clay is carefully removed.
Every filter receives its own number. This makes it possible to follow the production to the point of sale and use.
Before there can be further work on the filter it must dry for two to three weeks.
Now the filter can be fired. The firing process takes place at various levels of heat in a 12 to 13 hour timeframe. During this process the kiln reaches a temperature of up to 700 degrees Celsius. The sawdust is burned away and what remains are micropores in which bacteria and other toxins accumulate.
After the filter has cooled off it is quality controlled. It is tested for clarity of water, rate of filtration, and bacteria. Every filter is then washed several times and painted with silver nitrate for chemical disinfection.
After passing quality control, the filters are placed into a bucket with an integrated faucet to make it easier to take out the clean water. The buckets have stickers which explain the use and cleaning of the filter in a clear step by step manner. Now the filter is ready to sell.