How to test the effectiveness of a pocket filter in the field?

Testing Setup

To test the effectiveness of a pocket filter in the field, you’ll need a few basic items: a squeeze bottle, a container of contaminated water, and a clean container to collect the filtered water. Mix a spoonful of mud or clay into a liter of water to create a contaminated sample. This will provide a reasonable test of the filter’s capabilities.

Testing Procedure

Attach the pocket filter to the squeeze bottle and slowly squeeze out the contaminated water into the clean container. Measure the time it takes to filter the water, and note any changes in water flow or pressure. This will give you an idea of the filter’s clogging potential and how it handles varying water pressures.

Evaluating Performance

To evaluate the effectiveness of the pocket filter, fill a second container with the filtered water and inspect it for suspended particles. Use a small cup or jar to collect a sample of the filtered water and observe it under a magnifying glass or with the naked eye. Compare the filtered water to the original contaminated water to assess the filter’s performance. As a general rule, a pocket filter is considered effective if it can remove at least 99% of suspended particles and contaminants from the water.