Re: Listen to this!

[Jacques BESSON <jbesson@club-internet.fr>]

There is 2 types of ion exchange resins :
- one changes Ca+.. with Na+ , so you increases your salinity; this type is
regenerated by use of NaCl.
- others ( uncommon in Europe,but in an other country I don't know) are
cationic/anionic resins , cations are replaced by H+ and the cations give
acids ; acids are , after ,  eliminated, through anionic resin ,by
combination with OH-. This type is regenerated by acid and soda.
J.Besson
PS in march, a message was  about Ani Katti resins , they are from the 2nd
type.


jgarden2000@juno.com a écrit:

> I got this aquarium book (titled 'Pet Library Advanced Aquarist Guide')
> at a used book sale recently. There's a section on filtration that reads
> as follows (the last sentence is the important one):
>
> "A recent innovation is the introduction of ion exchange resins to
> construct filter beds. Available resins will remove both organic and
> inorganic soluble introgenous compounds. Used with discretion, they could
> be of use to control algae. Resins that could change the pH and hardness
> of the water are also available but it is doubtful if these will be of
> great practical value to aquarists."
>
> What do you think? Do you still agree that those wouldn't be of value
> today (the copyright on the book is 1969)?
>
> Thought you'd like to hear about that. :-)
>
> William
>
> Please visit our website at
> homestead.juno.com/jgarden2000/aquaria.html
>
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