if nothing else to understand more about the impact of pressure in the reactor that Zeus also pointed out.
I run my reactors at a low pressure compared to what foxfish did esp with having a bypass fitted to keep flow optimal in the tank, the flow I can have in the reactors can be very low with the bypass fully open and yet i still get fast 1.5pH drops but at a high CO2 injection rate
I have recently fitted Maxspect Gyres for tank flow/turnover is well taken care off. I have tried running the reactors at higher pressures/flow rates but they become too noisy and no net gain in the test I have done so far.
Filter flow rate isnt that important IMO is it doesnt increase the biological filtration rate it will pull more water though so will help remove more particles so mechanical filtration will be faster, but if you can keep the turnover higher in the tank by other means the particles will remain suspended in the water longer and the mechanical filtration will happen. As @ceg4048 points out to us the largest biological filters in our planted tanks are the plants esp the plant roots. Flow/Tankturnover is 'KING' in the planted tank for which we mainly use filter output to get, the advise is X10 output per liter of tank water, but we can also use powerheads etc to get the flow/output then the filter output is less a critical factor. We have also discussed the tanks at Green Aqua on the forums - stunning tanks Very high light yet relatively low flow/turnover rates, I have been to Green Aqua and they are stunning with relatively low flow rates