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Firstly, the working pressure will depend on the type of diffuser used in the setup. For example, "atomizer" type diffuser would require about 40 PSI of working pressure. 15 PSI would not be enough. In fact, if the working pressure is insufficient for driving the specific diffuser type, that's...

People use 5/8 transparent tubing with these filters (assuming the fitting diameter of your filter is the same as 406) http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=8003 This diameter also works with inline heater and inline CO2 diffuser. To ensure watertight connection use...

It depends on what kind of cleaning and what kind of filter you are talking about. For a typical HOB filter, like Hagen Aquaclear, regular cleaning boils down to squeezing the sponge(s) in the aquarium water and, maybe, quick-rinsing the basket and the interior of the filter itself. This is...

It doesn't really "defeat" the point of injecting CO2. It just reduces the efficiency of the process, since it helps the dissolved CO2 to escape faster. For example, a HOB filter will also have similar effect on dissolved CO2. Yet, people use CO2 with HOB filters. Again, it works, albeit less...