Re: ca co3 as a filter

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From: ROY MAYEDA (roymayeda@yahoo.com)
Date: Fri Oct 10 2003 - 15:00:56 PDT 

Message-ID: <20031010220056.26347.qmail@web20418.mail.yahoo.com>
Date: Fri, 10 Oct 2003 15:00:56 -0700 (PDT)
From: ROY MAYEDA <roymayeda@yahoo.com>
Subject: Re: ca co3 as a filter

I'm pretty sure the use of diatomaceous earth as a pool filter material has to do with its structure rather than its chemical composition. Some microscopic algae (diatoms) produce a framework ("skeleton") of carbonate or silicate materials. These crystals accumulate on the ocean floor as the organisms die and sink, forming layers of diatomaceous earth. (If I remember correctly, the silicate forms can convert to chert, and the carbonate forms to limestone -- over time.) The structure of the microscopic skeletons give the diatomaceous earth relatively high porosity, so it will pass water with less resistance than other materials, like clay. The gaps are still small enough to filter out larger debris (dirt, etc) from the pool water.
 
Roy Mayeda
Still at large!
Wheaton, MN

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