| 摘要 |
A device for dosing a liquid product into a flow of liquid, the device comprising a dosing chamber (6) for the liquid product, said chamber having a porous wall (26) through which the liquid product is transported when the porous wall is within the flow of liquid but which retains the liquid product within the dosing chamber when the liquid flow is removed, and a constant head construction (14,30,36) such that the hydrostatic pressure of the product in the chamber (6) is substantially independent of the head of liquid product above it.
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