Hi,
Maybe I'm not the best person to answer your questions, but this is what I've learnt from my experience of using the Eheim 2026.
The filtering process sounds simple, but there are actually lots of subtleties involved. Like for example, you need the impeller to draw the water out of the filter also and the impeller motor is one of the more crucial but less noticed part of the filter. Also the quality of the filter media and design of the parts of the filter itself to ensure no failure with long term use.
I've never used other filters before but my 2026 is placed in my aircon bedroom and there its absolutely silent. I guess this shows the quality of the motor and the impeller used in eheim models.
I guess the placement of the filter media is important. For my 2026, there are built-in check valves to ensure no water spillage when you want to stop the filter for changing of media etc. I've stopped the filter and removed all its hoses without a drop spilling in my bedroom.
I hope this helps you in making your decisions when you decide to purchase a filter.
"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled" - Richard Feynman, 1986. Rogers commission into the Challenger disaster
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