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1. CONCEN (Inflow Concentration)
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Use When:
- A known concentration of a substance is entering the network at a node.
- Suitable for modeling water quality from a treatment plant or a constant inflow source.

Behavior:
- Introduces water with a fixed concentration into the node.
- Can be combined with a time pattern to vary the concentration over time.

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2. MASS (Mass Inflow Booster)
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Use When:
- A fixed amount of mass needs to be injected into the system.
- Appropriate for booster stations or continuous dosing scenarios.

Behavior:
- Adds a fixed mass rate at the node, regardless of the hydraulic flow.
- The amount added does not change with water demand.

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3. SETPOINT (Set Point Booster)
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Use When:
- The objective is to maintain a desired concentration at a specific node.
- Often used in feedback-based control systems or sensitive zones.

Behavior:
- Adds just enough mass to bring the outgoing concentration at the node up to the setpoint.
- Does not inject if the incoming concentration is already at or above the target.

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4. FLOWPACED (Flow Based Booster)
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Use When:
- Chemical dosing needs to be proportional to the flow rate.
- Common in scenarios where dosing systems automatically adjust with demand.

Behavior:
- Injects mass proportional to the inflow at the node.
- Higher flow rates result in more mass being injected.
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