Method and system for determining liquid levels in sand filters and effective air scouring during backwash

A filtration system comprising:

• a filter device, wherein the filter device comprises:
• a tank,
• a drainage section at a lower most end of the tank,
• a filter medium above the drainage section and below an upper most end of the tank, and
• a plurality of sensors provided on the tank, wherein a first sensor of the plurality of sensors is on a top of the tank, a second sensor of the plurality of sensors is on an upper most end of the tank, and a third sensor of the plurality of sensors is on a lower most end of the tank,
• wherein the first sensor is configured to measure a first height of the filter medium, and
• wherein the second sensor and the third sensor are configured to measure a second height of fluids within the tank,
• wherein air is configured to be pumped through the filter medium during an air scouring cycle;
• and
• a control system operational coupled to the filter device, wherein the control system is configured to maintain the fluids at the second height at a predetermined distance above the first height during the air scouring cycle.

A filtration system comprising:

• an untreated fluid reservoir fluidly connected to a filter device, wherein untreated fluids from the untreated fluid reservoir are configured to be injected into the filter device;
• a treated fluid reservoir fluidly connected to the filter device, wherein treated fluids from the filter device are configured to be injected the untreated fluid reservoir;
• a waste fluid reservoir fluidly connected to the filter device, wherein waste fluids from the filter device are configured to be injected the waste fluid reservoir;
• wherein the filter device comprises:
• a tank;
• a drainage section at a lower most end of the tank;
• a filter medium above the drainage section and below an upper most end of the tank;
• a plurality of sensors provided on the tank, the plurality of sensors being configured to measure a first height of the filter medium within the tank and measure a second height of fluids within the tank;
• and
• a control system configured to maintain, by increasing or decreasing a volume of the fluids, the second height a predetermined distance above the first height based on data from the plurality of sensors.