The collection wells are a key element in nautical systems, often underestimated but fundamental for the management of grey, black or bilge water , as well as for ensuring safety and hygiene on board .
🚧 What are collection wells?
Sumps (or collection tanks) are waterproof containers or tanks installed below deck or in technical compartments, which collect wastewater or seepage before it is disposed of via:
⚙️ Main types of collection wells
| Type |
Typical use |
Connection to... |
| Shower well |
Collecting water from indoor or outdoor showers |
Automatic drain pump |
| Sink well |
Temporary grey water collection |
Grey water pump or sea discharge |
| Bilge well
|
Water on board, engine or pipe leaks |
Bilge pump |
| Engine well
|
Oil/water leaks in the engine compartment |
Manual or electric pump (with filter) |
🔧 Recommended technical features
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Materials : reinforced plastic (ABS), fiberglass, stainless steel for harsh environments.
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Integrated pump : they are often equipped with an automatic float pump , for automatic draining.
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Filter or screen : To prevent hair, debris or dirt from blocking the pump.
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Inspectable lid : useful for maintenance and cleaning.
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Level sensor (optional) : activates the pump only when a certain water level is reached.
🧭 Example: Shower collection well
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Input : 19mm pipe coming from the shower tray
-
1-2 litre watertight container
-
Integrated Rule or Johnson automatic pump
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Outlet : sea discharge pipe with non-return valve
✅ Advantages
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Avoid stagnation and odors on board
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Protects pumps and pipes from debris
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Allows the controlled and safe discharge of grey water
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Essential for compliance with environmental regulations
