From the category archives:

Water Filters

Updates From The MetaEfficient Kitchen Labs

July 5, 2009

This summer I’ve been working on food-related optimization projects, here are some updates:
I now have subscriptions with two local farmers (through a CSA or Community Support Agriculture). One farmer provides me with raw milk, raw butter and eggs, the other farmer provides vegetables and fruit. They both happen to deliver to same street in my neighborhood, so [...]

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Use An Ozone Generator To Purify Your Air and Water Inexpensively

July 4, 2009

One of the simplest and most inexpensive ways to purify water is to bubble ozone through it. Ozone is a molecule made of three oxygen atoms ( O3). It disinfects water very effectively, through a process called oxidation. Ozone ruptures the cellular structure of organisms, killing them. It also oxides toxic organic chemicals, minerals and [...]

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The Best Water Filters Of 2009

January 15, 2009

Note: To jump straight to the water filter reviews click here.
If your are looking to find the best water filter, you’ll probably encounter a lot of misleading claims. Much of the misinformation comes from manufacturers eager to sell expensive water filters. Government sources also tend to gloss over issues of water pollution — it’s not [...]

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How To Filter Your Drinking Water Very Efficiently

February 18, 2008

I’ve spent quite a bit of time researching how to filter drinking water effectively. Originally, I was interested in filtering the rainwater that falls on my roof. But I had to put that project on the back burner for now. During my research I noticed that there is little unbiased information available on water filters [...]

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Very Efficient: Pocket Filter by Katadyn

February 23, 2006

This is a serious portable water filter from Katadyn. It’s efficient because it uses a ceramic filter, which will not let anything larger than 0.2 microns through. It also has a long life — it will filter up to 13,000 gallons before you need to replace the cartridge. The filter eliminates bacteria, viruses, cysts, protozoa, [...]

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Most Efficient Water Cleaner: Terra Cotta Gravity Water Filter and Cooler

January 24, 2006

Here is another efficient ceramic water filter. This gravity filter has a hand-made terra cotta base, which cools the water using natural convention.
We consider metaefficient because: its has excellent filtration, and a very long filter life (years). Also, the terra cotta doesn’t leach contaminants into the water, and it keeps the water cool without needing [...]

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Berkey Light Gravity-Flow Water Filter

January 23, 2006

Gravity filters are more effective than other types of water filter, because the water drips slowly through the ceramic elements, and this process removes almost all the contaminants in water. The filters can be cleaned with a toothbrush and last for up to 2,000 gallons. This Berkey Light filter uses Black Berkey elements, and they [...]

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Slow Sand Filters

January 20, 2005

Slow sand filters are perhaps the most efficient means of producing clean drinking water.
Slow sand filters rely on biological processes for their action rather than physical filtration or disinfection. They require no electricity, no chemicals and no filter changes.
How is this possible? The secret is that slow sand filters work through the formation of a [...]

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Producing Drinking Water from Rain Water

July 26, 2004

  

It is possible to produce pure drinking water from rain water
using a combination of devices costing around $300 total.
Here’s how to do it:

Install a roof
washer and a rain
barrel ($200). A roof washes diverts the first ten gallons or
so of rain water away from your barrel — it contains such things
as dust and [...]

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