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>Date: Wed, 18 Feb 1998 11:29:03 -0500
>From: "Karen A. Randall" <105165.3234 at compuserve_com>
>Subject: Laterite
>Sender: "Karen A. Randall" <105165.3234 at compuserve_com>
>>      What makes the Dupla worth the difference in price. Is your
>>based on performance, composition, or marketing?
>It's based on experience with all three products (plus the old AP laterite)
>in a number of tanks over a long period of time.  With my tap water and
>maintenance routine, Dupla laterite clearly produces the best growth, at
>least in the first 6-9 months.  Substrate Gold comes next, and Theil
>laterite comes next.  AP laterite probably ranked close to Substrate Gold,
>but was much harder to work with in terms of suspended particles.
>I suspect that the initial growth with the other products could be
>increased with the use of small amounts of solid NPK fertilizers, as I
>suspect that those are the main ingredients in Dupla's "rooting tablets". 
>But Dupla has done the work determining how much of these elements need to
>be supplied in the early months of a tank's life, and it doesn't require
>trial and error to determine how much you need.  I find this convenient,
>and it can be indispensable in the case of a novice aquatic gardener
>without reliable help and supervision.
>BTW, any one who's known me for any length of time knows that marketing
>doesn't impress me much ;-)  I stick with products that work for me.
>  E-mail from: Karen A. Randall, 18-Feb-1998