Aspect ratio flow metering device and methods of using

An aspect ratio flow metering device comprising

• a concentrate inlet portion,
• 2, 3, 4, or 5 restricted flow portions of tubing arranged in parallel, fluidly connected to the concentrate inlet portion,
• a metered concentrate outlet portion fluidly connected to the 2, 3, 4, or 5 restricted flow portions of tubing, and
• a Venturi mixer comprising a metered concentrate inlet portion, the metered concentrate inlet portion is fluidly connected to the metered concentrate outlet portion of the 2, 3, 4, or 5 restricted flow portions of tubing, wherein:
• the narrowest part of the 2, 3, 4, or 5 restricted flow portions of tubing each having a length (RL):
• inner diameter (RID) ratio of at least 10:1;
• the metered concentrate outlet portion having an inner diameter (OID) greater than RID;
• the metered concentrate inlet portion having an inner diameter (IID) greater than RID;
• and
• the length (RL):
• inner diameter (RID) ratio of at least 10:1 of the 2, 3, 4, or 5 restricted flow portions of tubing is structurally configured to limit flow of a concentrate into a hydrodynamic mixing apparatus;
• the metered concentrate outlet of the aspect ratio flow metering device is fluidly connected to a concentrate inlet of the Venturi mixer;
• and
• the length (RL) is a mean tubing length of the 2, 3, 4, or 5 restricted flow portions arranged in parallel.