Before You Buy A Home Water Filter

Before You Buy A Home Water Filter

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Before You Buy A Home Water Filter

This is the Clearly Filtered water pitcher, it is in use every single day at the Cascio homestead. It helps filter out the iron bacteria from our well water.

This is the Clearly Filtered water pitcher, it is in use every single day at the Cascio homestead. It helps filter out the iron bacteria from our well water.

While reading through the forum, I came across a post that asked about water filters.  I have seen this type of post before and is somewhat common.  The question was asking if a certain type of home water filter will remove bacteria, cyst or protozoa.

Municipal drinking water can become contaminated in several ways.

During events like a hurricane, trees can uproot and either crack or break water lines.  The compromised lines allow contaminants to enter the water supply.

Then there are examples like Cryptosporidium that are resistant to chemical treatment.

Sometimes pipes will freeze and burst in cold weather.

When drinking water becomes contaminated, how do you know if a home water filter will make the water safe to drink?

Micron Size

The Center for Disease Control and Prevention has a page that I refer people to – Water Disinfection for Travelers.  All the way to the bottom of the page in section 2-10 the average size of waterborne organisms are listed.

Table 2-10. Microorganism size and susceptibility to filtration

ORGANISM AVERAGE SIZE (µm) MAXIMUM RECOMMENDED FILTER RATING (µm ABSOLUTE)
Viruses 0.03 Not specified (optimally 0.01, ultrafiltration)
Enteric bacteria (Escherichia coli) 0.5 × 3.0–8.0 0.2–0.4 (microfiltration)
Cryptosporidium oocyst 4–6 1 (microfiltration)
Giardia cyst 6.0–10.0 × 8.0–15.0 3.0–5.0 (microfiltration)
Nematode eggs 30 × 60 Not specified; any microfilter
Schistosome larvae 50 × 100 Not specified; any microfilter

If the water filter manufacturer does not list the micron size, then assume the filter does not remove cyst, protozoa or bacteria.

There are a lot of “finishing” filters on the market.  They use the word filter, but actually just improve the taste of the water.

From the Brita website – what are micron ratings and why doesn’t Brita have them?

Brita® filters are not intended to purify water. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection.

If you want a home based water filter, be sure to check the micro size and make sure the filter has a rating.

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May 19, 2017 at 09:40AM

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