Re: [APD] diatomite

["S. Hieber" <shieber at yahoo_com>]

Lots of good info. Wait until you come across some
micorscopic photographs, especially the colorized ones.
They are stunning.

sh

--- Billionzz at aol_com wrote:

> 
> Hi Scott, 
>  
> Thanks for your help,
>  
>  I was looking online to see if I could find  that brand
> in the Houston area 
> and thought you might be interested in this site,  the
> prices are a little 
> cheaper.
>
_http://www.coolpooldeals.com/pumpscleanersheaters/filteringmedia/diatomaceous
> .html_ 
>
(http://www.coolpooldeals.com/pumpscleanersheaters/filteringmedia/diatomaceous.html)
> 
>  
> Below is some information I found  interesting.
>  
> What is Diatomite? (Also known as  Kieselguhr and
> diatomaceous earth)
> Diatomite is a fossilised mineral  of vegetable origin.
> It is the 
> accumulation of an enormous number of fossil  diatoms. 
> 
> Diatoms are single cell plants of microscopic size. There
> are  many varieties 
> that live in both freshwater lakes and saltwater oceans,
> staying  close to 
> the surface where they form part of the abundant
> plankton. Alive, they  are at 
> the base of the food chain. Dead, they leave a tiny
> skeleton known as a  
> frustule. 
> 
> Whereas most other plants use solar energy to synthesise 
> cellulose for their 
> cell walls, the diatom extracts amorphous silica from the
>  water, building 
> for itself what amounts to an elegant, but strong shell
> with  highly symmetrical 
> perforations. 
> 
> Diatoms reproduce themselves in bi-cell  divisions every
> few hours and it has 
> been estimated that a single diatom could  produce up to
> 1,000,000,000 diatoms
> 
> In its natural (milled) state, the  individual diatoms
> are extremely small 
> and would form a very fine (low  permeability)
> filter-cake, which would be too â??
> slowâ?? for most filtration  applications. To create
> larger particles, the 
> diatoms are fused together at high  temperatures. These
> larger particles are then 
> classified, according to their  specification. 
> 
> Large deposits are now open-cast mined in the USA, 
> Northern Europe and 
> Iceland. 
> Two types of Diatomite are  processed:
> 
>     1.  Freshwater origin, which are tubular and
> extremely effective  and 
> efficient in the removal of very fine solids and
> applications where fast  
> flow-rates are required. All types are processed at
> temperatures ranging from  8000 
> to 11000°C. Both calcined and process-calcined Diatomite
> filter aids are  free 
> of organic matter and are non-absorptive. Celatom is a
> fresh water brand  of 
> diatomite.  
>     2.  Seawater origin, which are composed of rods,
> flowers, boats  and 
> snowflake shapes. These have the same use as freshwater
> daitomites, they  are just 
> a different shape.
> 
> 
>
(http://www.flexibulk.co.uk/flexibulk_web/ask_bulk.html#top)
> 
> Bill
> _______________________________________________
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> Aquatic-Plants at actwin_com
> http://www.actwin.com/mailman/listinfo/aquatic-plants
> 

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