Both are GOOD filter, the 2026 is a standard WET filter as the media are soak in water all time. compare to The EHEIM professionelwet/dry filters 2027 or 2029 offer efficiency surpassing that of a trickle filter. The water movement within the filter is bi-directional allowing for extended contact time between bacteria colonies, oxygen and toxins, which are thus decomposed much more rapidly than in a traditional filter. less air contact.
Decomposition of ammonium - 73% faster, nitrite - -67% faster.
Exchange of oxygen and CO2 is accomplished by means of displacement through the specially designed breathing tube.
The water output pulsates as the filter fills and empties, achieving a wavelike action which prefer for Marine tank compare to a planted tank.
from eheim website. hope this helps
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