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Re: ph-kh-co2 / Farowellas vs. Peckoltias

To: Aquatic-Plants at actwin_com
Subject: Re: ph-kh-co2 / Farowellas vs. Peckoltias
From: George Booth <booth at hpmtlgb1_lvld.hp.com>
Date: Thu, 24 Jul 1997 09:48:58 -0600
In-Reply-To: Your message of "Wed, 23 Jul 1997 15:48:06 EDT." <199707231948.PAA01934 at acme_actwin.com>

> Date: Wed, 23 Jul 1997 09:31:16 -0500
> From: berzerker7 at juno_com (Robert S Spotswood)
> 
> ph-kh-co2
> 
> This may be slightly off-topic, but to those of you concerned about
> the % differences from the different equations, don't be.  Generally,
> (in engineering at least), any empirical equation that gets you to
> within 30% either way of the "true" answer is considered a good
> equation.  

As an engineer, I have to take issue with that statement.  +/-30%? 
Please let me know exactly what products you "engineer" so I can avoid
them. 

> Here you're talking about 10-20% differences.  Don't sweat
> it.  These are only estimates, with more than a few assumptions.
       ^^^^^^^^^^^^^^^^^^^^^^^^
Sorry, these are NOT estimates. They are calculations based on well
defined scientific principles.  Any assumptions involved
(temperatures, etc) have an extremely small effect on the results.    

George

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