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Re: CO2 concentration

Reasearch has shown that submerged aquatic macrophytes saturate their Ps 
rates at about 30 mg/L. At ambient CO2 concentrations (~ 1 mg/L), Ps rates 
are typically 10 to 20% of max. A concentration of 15 mg/L will produce 
Ps rates somewhere between these two values. George Bowes states that," 
The major contributing factor to these high values [saturation at 30 
mg/L] is the diffusion resistance of water (Bowes. 1985. Pathways of CO2 
fixation by aquatic organisms.)." This suggests that the optimal strategy 
for CO2 fertilization is to also increase the water movement within your