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The outdoor barrels are supplied by an aluminium extensible and flexible heating duct, connected to the vertical pipe of evacuation of rainwater of the roof. The clear color barrel is placed a little higher than the other one, so that it can fill the second one when the first is full via the flexible tube located between the two barrels. When the second barrel is also full, the long grey pipe evacuates the excess water into a gutter which gives access to the underground network of evacuation of rainwater.

The dark grey pipes that one sees above barrels go into the house towards the pump (see diagram). They are isolated from the cold by expanded polyethylene pipes for insulation.

At the bottom of the barrel, the pipes end with a strainer which stops the vegetal wastes, preventing them from arriving to the pump, which would risk to deteriorate it.

The matter of the barrels is to be chosen with precaution : there are two categories of plastics, those which resist freezing and which do not require a draining of the barrels in winter (The water of the barrels may be completely frozen without any damage.); there are also those barrels which crack when water freezes and that sort of plastic must absolutely be avoided.

The frost-resistant plastic barrels are increasingly difficult to find (in France) and they are generally manufactured in countries where cold weather is common (Scandinavian Countries, the United Kingdom, Germany and Belgium in particular.)

At the bottom of each barrel, I can permanently leave a few pieces of charcoal which prevents the water from rotting.