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Hi,
I have a question for…I’m looking into Rain Harvesting from my roof, and I’m looking into a 275gal to 550gal storage with first flush. With diverting roof water from storage to a Slow Sand Filter as described in http://www.slowsandfilter.org/ If I add boiling the output water, do you think that would make the water potable enough given an emergency situation?
I’m trying to find an H2O solution that requires no power. I think if I use the design for the slow sand filter, with activated charcoal, coupled with boiling it should provide a potable solution. Your test results were eye opening to say the least. My only other alternative would be distillation of rainwater from a slow sand filter….
Thank-you for the great information, and your hard work!
Thanks,
Mike Watson
Boiling would take care of biological contamination if done at sea level and for a long enough time to kill all the viruses and bacteria, I think ten minutes is the minimum time recommended. Chemicals from roofing material are not removed by boiling the water in question, and may be concentrated as the water evaporates. Every situation is different and the best way to determine what is in water is to have it tested; and each filter owner/operator is solely responsible for the filter’s proper operation. That said, in an emergency situation, given the choice of meeting my maker from becoming dehydrated, or drinking water from a mud puddle, or filtered roof water from a slow sand filter I’ll take the filtered roof water.