ExFlow - external overflow from aquarium to LSS

The following sequence should be observed for commissioning:

1. Mount the ExFlow on a side or rear window.
2. Fix the distance of the ExFlow with the fixing strip.
3. Secure the ExFlow against tilting with the enclosed plastic screws inside and outside.
4. Connect the drain: it should end in the filter tank just below the water surface; use an angle seat control valve or diaphragm valve for control.
5. Connect the emergency overflow: it should end just above the water surface. Do not use a valve in this line.
6. Close the drain completely.
7. Fill both chambers of the ExFlow with aquarium water.
8. Use the suction hose to suck air out of the transfer tube. A little water may need to be added to the rear chamber during suction.
9. Close the suction hose with the supplied hose clamp if water appears in the suction hose.
10. Open the drain completely.
11. Put the return pump (from the filter basin to the aquarium) into operation.
12. If the water runs from the aquarium into the inlet chamber of the ExFlow, you can read the actual water flow from the engraved scale (only with completely) opened drain valve!
13. Now slowly close the drain valve until the drain pipe contains no more air bubbles and the bubbling noises have completely disappeared. From the emergency overflow should run at most a small amount of water.
14. If you operate the ExFlow far below the permitted maximum flow rate, it can happen that the water from the aquarium falls noisily into the inlet chamber. In this case you can reduce the drop height by inserting a PVC pipe in the emergency overflow.

 We recommend that the return pump be fitted with a shut-off device to prevent flooding if the water level in the aquarium is too high. 

If the fall height of the drain is less than 80 cm and you still want the full water capacity to run through the system, then please select the drain valve (angle seat control valve, diaphragm valve) one size larger and adjust the drain diameter accordingly. We will be happy to advise you. 

• ExFlow with fixing system
   
• 2 screens (filter combs)
• cover
• transfer tube with suction connection
• connectors made of PVC

We strongly recommend the installation of a fine adjustment valve in the outlet of the system to avoid suction noise. Although ball valves are cheap, they are only of limited use for this purpose.

please choose the model size

Leaflet

Instruction manual

please choose the model size

 Aquariums with external overflow can always overflow if maintenance is neglected. Especially extremely dirty filter grids can cause malfunctions. Due to the system, an emergency overflow cannot be installed inside the aquarium.

 If the diameter of the drain pipe is narrowed or the minimum drop height is not reached, the maximum capacity cannot be achieved.

 If the ExFlow is operated below the minimum volume flow, air may collect in the transfer tube and raise the water level of the aquarium.