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input file PHREEQC

Dear Dr Parkhurst,
 
Just a quick question to check if I can use Si data instead of SiO2 (in ppm) in the PHREEQC input file.
The following Solution 1 has 5.25 mgL-1 of Si. Is the input file correct or do I need to convert the Si to SiO2?
 
 SOLUTION 1
 temp                20.8
 pH                  7.65
 units ppm
 Na              128.0000
 K                10.4000
 Ca               13.0000
 Mg                6.4400
 Si                5.2500
 Cl              132.0000
 Alkalinity      136.0000 as HCO3
 S(6)               68.6000 as SO4
 N(5)                0.0000 as NO3
 N(+3)              0.0000 as NO2
 Amm               0.0000 as NH4
 Al                0.0053
 B                 0.2200
 Ba                0.0650
 Br                0.3210
 F                 0.5200
 Fe                0.3220
 Li                0.0182
 Mn                0.0242
 Sr                0.1150
 
Thanks a lot for your kind help.
 
Regards, Teresa

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