Seachem Tidal 55 External Filter by Sicce

Ventilation slots in the lid of the filter and the aeration grooves in the outflow ensure that water returned to the tank is fully oxygenated and maximizes gas exchange The pump pushes water up into the basket of the filter, entering through the bottom and out the top.A bottom-to-top flow ensures that water is in contact with the filter media and cannot go around or over as with hang-on-back filters with a back-to-front flow Over time, filtration media can become clogged with detritus reducing or obstructing the flow of water.  When this happens, water is redirected around the filter and back into the tank through an outlet on the side.  A blue maintenance alert on the top of the filter tells you that it needs to be cleaned The surface skimmer will capture water from just below the surface where excreted fish oils accumulate - a dial on the side of the filter adjusts how much flow comes from the underwater intake versus the surface skimmerThe flow is adjustable using the dial on the