Recommended Flow Rate for a Family of Four?

Optimal Filter Design

When designing a water gravity bag filter for a family of four, consider a flow rate of 2-4 LPM. This allows for 50-100 gallons per day, sufficient for daily needs, including drinking, cooking, and hygiene. A filter with a diameter of 8-10 inches (20-25 cm) and a height of 20-30 inches (50-75 cm) is a good starting point.

Filter Material and Media Selection

For effective filtration, choose a filter material with a porosity of 0.2-5 microns. Ceramic or carbon-based media are suitable options. The media should be able to remove 99.9% of bacteria, viruses, and parasites, ensuring safe drinking water. Consider adding a pre-filter to capture larger particles and extend the life of the primary filter.

Maintenance and Upkeep

Regular maintenance is crucial to ensure the filter continues to function optimally. Check the filter’s flow rate weekly and replace the media every 2-3 months or when flow rate drops by 20%. Clean the filter’s exterior and replace any damaged or worn-out parts to prevent contamination.