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Manual calculations versus phreeqc

Dear Sir/Madam,
I would be very grateful if you could assist me in this query.

I am using Phreeqc to calculate calcite saturation indices for my PhD.
However, my manual calculations are coming out different to the Phreeqc
As a test I used data from a hydrogeology textbook (Fetter(2001) applied
hydrogeology, p360-1) which calculates calcite saturation manually. The
textbook gives a saturation index of 0.05 while Phreeqc gives a saturation
index of -0.02.
Can you tell me if this difference is significant and if so where I might be
going wrong?
I would welcome any suggestions.
Best regards,

Garrett Kilroy
PhD Candidate

Department of Geology/
Centre for the Environment
Trinity College
Dublin 2
Tel: +353 1 608 2403
Fax: +353 1 671 8047

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