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Re: Aquatic Plants Digest V3 #1293

Thanks Roger for your help. I still would like to know though, if anyone has
determined wether Ca and Mg are more valuable to plants than Na and K. If so
what ratio of these two sets of ions is the most beneficial? I ask because I
have high levels (I do not know this for fact but we see lots of mineral deposits
from evaporation and last time I tried to test the hardness it was off the scale
with the Aquarium Pharms kit) calcium. Obviously I need to confirm that the
Calcium levels are high, but if they are would it be beneficial to raise the
K and lower the Ca through ion exchange? I have some white diamond and hoave
no other use for it so maybe I will experiment a little and see what happens.
BTW, I agree that other products use this method, but I just learned that it
was those ions that are being exchanged.


>Date: Tue, 21 Sep 1999 14:31:28 -0400 (edt)
>From: "Roger S. Miller" <rgrmill at rt66_com>
>Subject: Re: White Diamond by Marineland
>I didn't respond to this question originally, because it sounded like
>Scott had some information about the product that was inconsistent with my

>expectation.  Now it appears that my expectations were probably right.
>Ammonium (the common form of ammonia in solution) can be removed from
>water by a cation exchange medium.  This is just as a cation exchanger can

>remove other positively charged ions like calcium or magnesium.  Other
>products (Amrid, for instance) have been on the market for years to do the

>same thing.
>How the exchanger will otherwise effect your water depends on how it's
>charged and on the starting composition of your water.  I suggest you use
>ammonium exchangers only when ammonia levels reach a point where getting
>some of the ammonia out is an overriding concern.  This probably means
>that you never need to use it in a heavily planted, well-lit tank.
>Roger Miller

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