It is now October 2, 2014. Filter 1, and filter 4 have output water with no (0) coliform and no (0) e coli bacteria present. The cistern water that flows through filter 2, and filter 3, has 4 cfu’s of coliform per 100ml and 20 cfu’s of e coli per 100 ml. See the images below:
These images are of filter 1, filter 4, and the cistern output water tests.
Tests on filter 2, filter 3 and filter 5 will be done in the next couple of weeks.
This is a great way to test sand water filters! Thanks for sharing.