Category Archives: Uncategorized

Uniformity coefficient of sand

To determine the uniformity coeffient of sand (from a chosen source):   First: Take a small sample of the sand and determine the sand grain size(wire mesh hole size opening) at which 60% of this small sample‘s weight passes through … Continue reading

Posted in Uncategorized | Comments Off on Uniformity coefficient of sand

Rain water harvesting and filtering

More about the maintenance of a slow sand water filter used to purify roof water: In this situation where rain water is captured and stored in a holding container to be later run through the slow sand filter and then stored … Continue reading

Posted in Uncategorized | Comments Off on Rain water harvesting and filtering

Rainwater harvesting regulation

Is government “rainwater harvesting regulation” really ethical? Some people probably will say yes, while others will probably emphatically say no!!!!! How about the privatization of water supply systems putting them in control of “corporate” entities? To this most rational people will … Continue reading

Posted in Uncategorized | Comments Off on Rainwater harvesting regulation

Slow sand filter construction and operation with roof water harvesting

More information. This is very important. The two most recently set up slow sand filters in operation here have some important lessons to be considered. In extreme cases, a diverter by itself, will not be enough of a pre-filter: Turbid … Continue reading

Posted in Uncategorized | 2 Comments

Rain barrels and roof water harvesting

I must say a word about rainwater harvesting and rain barrels in general. Rainwater harvesting and rain barrels in general are very good ideas.  The un-purified water from a rain barrel is still quite useful for all kinds of things … Continue reading

Posted in Uncategorized | Comments Off on Rain barrels and roof water harvesting

Science, observations, experiments, results, peer review and the internet

Biological sand water filters (otherwise known as slow sand filters) are becoming popular. To all those people who have put up YouTube videos claiming to have built a slow sand filter that can be backwashed by forcing water into the … Continue reading

Posted in Uncategorized | Comments Off on Science, observations, experiments, results, peer review and the internet

slow sand filter, biological sand filter – nomenclature vs design

First let me say; it has become increasingly obvious that collaboration is a powerful tool for the development of technology. Just look at Android which came from Linux – the ultimate technology collaboration example. When Linux first came out, certain people laughed … Continue reading

Posted in Uncategorized | Comments Off on slow sand filter, biological sand filter – nomenclature vs design