GSMguy
New member
<a href=showthread.php?s=&postid=9829057#post9829057 target=_blank>Originally posted</a> by OrionN
Wet dry filter is a type of filter where there is a large surface area (like bioball or plastic mesh and the like) that water from the tank flow over while exposed to air and oxygen. This type of filter quickly oxidize ammonia to nitrite then nitrate.
A sump is not a wet-dry filter but just an area where water overflow to (usually under the tank) then got pump back up to the tank. Sump is where lots of equipments and additive are add in so that the display tank can be free of equipments. The overflow action also oxygenated the water as water overflow to the sump and then pump up to the main tank.
what OrionN said