skimmers double pump can be powered in two ways:
-the most common way is to mount a pump dedicated to food, with a flow regulator (a tap) instead of the aspiration pump or between the pump and skimmer;
-the second method is to connect the drain to the skimmer aquarium, saving a pump and optimizing the yield of the skimmer, the important thing is to study well the drainage system.
in the exhaust to be mounted in a low T with a reducer to connect the drain to the skimmer, one end is connected to the aquarium (exhaust) and the other sump and continues to be starting a bit 'higher than that connects to the skimmer.
The tap should be on the return pump and the drain, so as not to create further unnecessary friction that would reduce efficiency and to treat 100% of the water to the skimmer without wasting power.
The narrowing of the discharge also has the function of separating water from the air that this goes back and exits the second exhaust directly into sump without affecting the performance of the skimmer. This point is very important and you must be very careful to make it properly, so that it performs its function, otherwise it is much better to connect a pump dedicated and leave the open drain.
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