Patent ID: 8900448

Claim:
A hydrodynamic separator for treatment of a liquid flow containing solids comprising: a separation chamber; an inlet; a solids outlet; a liquid outlet; a permeable screen located in the separation chamber which divides the separation chamber into a first part into which the inlet and solids outlet open and a second part into which the liquid outlet opens; wherein in use liquid flow containing solids enters the separation chamber through the inlet and is caused to swirl within the separation chamber, thereby causing solids to exit the separation chamber through the solids outlet and liquid to exit the separation chamber through the liquid outlet, and an indicator arranged to indicate when the screen is blinded, the indicator being in fluid communication with the first part of the separation chamber such that if in use the screen becomes blinded, the pressure within the first part of the separation chamber causes an inflatable member to inflate, which indicates that the screen is blinded.