Adding Ultra Filters to Model 1.01

This model combines the same pump design as its predecessor with a custom-built housing of four gravity filters attached in parallel. Each filter is built from a membrane having an effective pore size of 0.1 micron absolute. 

This model has been built and tested with a flow rate of 4 liters per minute and a bacteria reduction of just above log 4. That is, an input of 2,000,000 colony forming units (cfu) per ml was reduced to 117 per ml at the output.