NOVELTY - A pulse flow circulation system (10) comprises an algae cultivation apparatus for growing an algal culture containing a biomass; a flush tank (28) positioned at an elevation above the algae cultivation apparatus for receiving an effluent of the algal culture; a circulation pump (22) connected to the apparatus, where the circulation pump draws the effluent of the algal culture and transfers the effluent to the flush tank; and an activator which is selectively activated to release the effluent from the flush tank into the conduit to create a pulse flow.    USE - As system for using a pulse flow to circulate algae in algae cultivation apparatus (claimed) for biofuel production.    ADVANTAGE - The system continuously grows algae in a more efficient manner by minimizing complications caused by biofouling; increases the productivity of algae growth; and is simple to implement, easy to use, and comparatively cost effective.    DETAILED DESCRIPTION - A system (10) for using a pulse flow to circulate algae in algae cultivation apparatus comprises an algae cultivation apparatus for growing an algal culture containing a biomass; a flush tank (28) positioned at an elevation above the algae cultivation apparatus for receiving an effluent of the algal culture to be used to create a pulse flow into the algae cultivation apparatus; a circulation pump (22) connected to the algae cultivation apparatus, where the circulation pump draws the effluent of the algal culture from the algae cultivation apparatus and transfers the effluent to the flush tank via a conduit (24) and where the conduit has a first end in contact with the algae cultivation apparatus and a second end connected to the circulation pump; and an activator, where the activator is selectively activated to release the effluent from the flush tank into the conduit to create a pulse flow of effluent through the algae cultivation apparatus. The algae cultivation apparatus is photobioreactor or sloped cultivation pond. An INDEPENDENT CLAIM is included for system for using a pulse flow to circulate algae in an algae cultivation apparatus involving cultivating an algal culture in an algae cultivation apparatus; circulating the algal culture using the algae cultivation apparatus; transferring a portion of algal culture to a flush tank using a circulation pump, where the portion of algal culture being transferred is an effluent; and flushing the effluent from the flush tank into the algae cultivation apparatus by initiating an activator to allow for gravity flow of the effluent from the flush tank into the algae cultivation apparatus via a transfer pipe having a first end and a second end, where the first end of the transfer pipe connects to the flush tank and the second end of the transfer pipe is positioned in the algae cultivation apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows layout of the system.    System (10)    Transfer pipe (20)    Circulation pump (22)    Conduit (24)    Flush tank (28)