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Design and Construction of a filtration system (sump) - 2

by John Salakidis

The second piece of Plexiglas was treated in almost the same way, except for a square in the center, measuring 15x15 cm, on which no holes were opened. This would be the place where the pipe of the overflow would end so the water would be spread all over the surface of the upper cover of the biological filtration compartment. In one end of the cover I even added a handle to make lifting it easier. This Plexiglas sheet was placed (not glued) on four supports (at its corners). The space between the two sheets was 13 cm while the top sheet was placed 7 cm below the tank's surface (see diagram and photos below). .

Thus, the space for biospheres measured now 60 x 50 x 13 (139 liters) - see photo below

The third sheet was added last and was cut in such a way to "embrace" the end of the overflow pipe (see photo)

In the end, I glued a small piece of Plexiglas which would support the sponge (see photo below)

Thus sump is now ready and the total cost is 140€

The next step is the addition of the pipes

For the overflow :

A hole was drilled on the side of the main tank with a diameter of 4,8 cm, 10 cm below the tank's surface (see photo)

We used 110 cm long PVC pipes with a 4 cm diameter, one valve, four corners and a tank connector with a 4 cm diameter.

Continued in next page

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