Category Archives: Rain water harvesting and slow sand filters

Slow Sand filter construction

Update October 22, 2013: This filter is still working after 2 years of continuous operation. The filter has been monitored regularly, and as a result,  a potential issue with the sand has been discovered. The bottom layer is too coarse, … Continue reading

More Galleries | Comments Off on Slow Sand filter construction

Slow sand filter operation during dry spells

Filter 4 and 5 now have re-circulation systems installed. Both of these filters had failed miserably in April/May of this year due to lack of water throughtput, and excessive organic debris present in the input water. Since the re-circulation systems have been … Continue reading

Posted in Rain water harvesting and slow sand filters | Tagged | Comments Off on Slow sand filter operation during dry spells

Biological water filtration with sand (why does it work?)

Biological sand water filtration (slow sand water filtration) works mainly because of living things we can’t see with our eyes. If water flows slowly enough through sand, it can be cleansed by these living microscopic organisms with help from gravity … Continue reading

Posted in Rain water harvesting and slow sand filters | Tagged | Comments Off on Biological water filtration with sand (why does it work?)

Roofing material and rain water harvesting

We have had water collected from a composition roof at this location tested by an EPA certified laboratory. The water passed (actually far surpassed) all epa, and local requirements for potable water purity after being run through a small slow … Continue reading

Posted in Rain water harvesting and slow sand filters | Tagged | Comments Off on Roofing material and rain water harvesting

Slow sand water filter operation and water clarity

A rudimentary test was done yesterday, October 2, 2013,  to evaluate water clarity on all of the filters running here. The filters that have the least restricted output flow also have the clearest water output. Two of the filters that have … Continue reading

Posted in Rain water harvesting and slow sand filters | Comments Off on Slow sand water filter operation and water clarity

Water filter test summary

After 4 years of college where I learned (hopefully) how to write about what I observe; and following that, close to 7 years of designing, building, studying, and operating small scale slow sand water filters (often called biological sand water … Continue reading

Posted in Rain water harvesting and slow sand filters | Comments Off on Water filter test summary

DIY 5 gallon slow sand filter update

Update November 25, 2013: An important observation regarding 5 gallon slow sand filters: They are highly susceptible to disruption from freezing temperature. For the past week all of the 5 gallon filters have been frozen. The temps here, in the forest, have been … Continue reading

Posted in Rain water harvesting and slow sand filters | Comments Off on DIY 5 gallon slow sand filter update

Sustainable water filtration

This blog, and the websites associated with it are an ongoing study of slow sand water filtration, which is a sustainable technology. In view of current events and the general decline of the quality of our environment on a local … Continue reading

Posted in Rain water harvesting and slow sand filters | Comments Off on Sustainable water filtration

Rainwater harvesting is not illegal (lets keep it that way)

Update; March 21, 2014: We have found that nearly every state in the U.S. allows rain water harvesting by individual home owners. Only a few states have severe restrictions. This could all change if citizens do not stay involved in … Continue reading

Posted in Rain water harvesting and slow sand filters | Comments Off on Rainwater harvesting is not illegal (lets keep it that way)

Slow sand filters in freezing weather

Update December 8, 2013: The temperature got down to 10 degrees F here last night – this was the last measurement we had, it is likely that the temp was lower than that (we are not actually in Seattle, we are way out … Continue reading

Posted in Rain water harvesting and slow sand filters | Comments Off on Slow sand filters in freezing weather