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Author Archives: filter_guy
Rain water harvesting and slow sand filter update
All the filters are still functional with the exception of one. The filter connected to the largest pond has been inactivated by damage due to the wildlife present here. We are reasonably sure the damage was caused by raccoons. The … Continue reading
How safe is your water?
To harvest rain water or use water from the public water supply – what to do? According to a recent article in the New York Times, which mentions the trouble with the Silver Lake reservoir near Los Angeles California, public … Continue reading
Microcystin removal by slow sand water filtration
Will a slow sand filter take out microcystin toxins more effectively than conventional water filtration (rapid sand filtration) ? It appears as though the answer is yes: http://www.ncbi.nlm.nih.gov/pubmed/12203961 (information is in the abstract; access to the entire document requires a … Continue reading
What if the public water system becomes unusable?
What would you do if you found out that the public water system had been contaminated by powerful toxins that could not be removed by boiling? Setting up a rain barrel or two might be a good idea. Incidentally, according … Continue reading
DIY 5 gallon slow sand filter update
Back in September of last year, we started 3 small 5 gallon slow sand filters. They are still running, and marginally cleaning the water that runs through them. So far, the best water quality is from filter 10b, followed by … Continue reading
Five gallon DIY slow sand filter update
The five gallon slow sand filter experiment, mentioned in September of last year (2013) is still in progress. Due to some unforeseen issues, the EPA tests cannot be done as of yet. We will attempt to start some field tests on the three … Continue reading
Designing a DIY slow sand filter: what to consider
Update April 16, 2017: The 5 gallon filters, and the smaller 6 inch filter mentioned in this post DO NOT WORK. They either add biological contamination, or do not remove any biological contamination. Do not use them. I am writing … Continue reading
A counter top slow sand water filter
This filter (we call it a “micro” filter) uses a 2 liter soft drink bottle, a rubber band a plastic straw, some plumbers putty, and coarse sand and fine sand. The fine sand on the top is .15 mm effective … Continue reading