Re: [APD] Micron filtration and nutrients

["Andrew McLeod" <thefish at theabyssalplain_freeserve.co.uk>]

On Wed, 29 Sep 2004 14:02:01 -0400, Sean Kettle <kettles at videotron_ca>  
wrote:

> I have a HOT Magnum that I like to put on the tank once a week to polish  
> the
> water.
>
> Which elements, if any, will be stripped from the water column from a  
> micron
> filter.  I believe Marineland says the filter is good for particles down  
> to
> 4 microns.
>
> Would any of the macro nutrients be removed?  What about traces?
>
> Just curious... Otherwise I'd run the micron all the time as a secondary  
> for
> some additional movement in my 75 gallon.

Atoms are way, way, way, way smaller than 4 microns. If your filter could  
get anything like the size of elements, it would be filtering out the  
water molecules as well... i.e. it wouldn't let the water through (this  
technique is regularly exploited in many household objects, such as  
kettles, saucepans and cups!)
Most of the macro nutrient, such as NO3, PO4, CO2 etc are simple, small  
molecules, and are (at a very rough guess) at least 10,000 times smaller  
than 4 microns?
It's not going to remove anything that is dissolved.

--
Andrew McLeod
thefish at theabyssalplain_freeserve.co.uk

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