Roller bottle system

A roller bottle system comprising:

• roller bottle means having an interior surface defining an interior volume characterized by a predetermined internal longitudinal length, a predeterminable internal width measured transverse to said predetermined internal longitudinal length, and a predetermined internal perimeter measured transverse to said predetermined internal longitudinal length, said roller bottle means further having a closable opening through which access to said interior volume of said roller bottle means is obtained;
• and
• insert sheet means for maintaining particulate matter in suspension in a fluid during operation of said roller bottle means, said insert sheet means being formed of resilient material having a longitudinal length which is shorter than said predetermined internal longitudinal length and a width dimension which is greater than said predetermined internal width and shorter than said predetermined internal perimeter, said insert sheet means having an undeployed state during which said insert sheet means is inserted into said roller bottle means through said closable opening, and a deployed state after said insert sheet means is inserted into said roller bottle means, said insert sheet means further having:
• first and second longitudinal edge portions arranged along respective first and second longitudinal edges thereof, said first and second longitudinal edges being distal from one another by a distance corresponding to said width dimension, said first and second longitudinal edge portions being urged against respective portions of said interior surface of said roller bottle means during said deployed state.