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Hi again Joe (that's better!) If you run a filter on one branch and the extra pump includes an inline heater then I doubt you'll want to turn either off in which case back flow won't be an issue. However if you only run co2 off your extra pump and stop it when co2 is not in use then whilst you...

Morning J Butler (very formal) try googling pumps in series v parallel. Basically what you propose is putting 2 pumps in parallel which means that in theory the resultant flow will be the sum of each individual flow (although in practise it is usually somewhat less). As long as the resultant...

Hi Foxfish. What I am saying is that the resistance to flow of a number of small holes will always be greater than the resistance of a single hole with the same cross sectional area of all the small holes added together - primarily because of the increased turbulence at each hole. The smaller...

Hi Greenview ! Sorry only just seen this post. Have you considered an external circulation pump which can be hidden in your cabinet and connected directly to a spraybar (or any other outlet) ? I use an eheim compact + 2000 modified as a needle wheel for CO2 - the CO2 is introduced before the...

I've had an Aqua One 1000 running since Jan 2007 with no problems - gives a steady 600 lph. I even left it running for a couple of days with the taps closed once with no ill effects. The instructions leave a bit to be desired though. Its design is very similar to the Eheim 2222/2224 so I...

Morning Idris - I agree. Fluid dynamics are not nice. You're probably not bothered now but I just had a thought. I remembered seeing a table of flows under gravity (drains essentially) for different size pipes so you don't have to factor in pumps, velocities, lengths etc. I've had a search and...

Back to the original question ! You can't really predict flow directly from pipe diameter alone. In a nutshell fluid flowing through a pipe is subject to resistance from various sources one of which is friction caused by rubbing against the sides of the pipe. The amount of friction is related...