Filter Clear

The reverse flow of water, through a filter or filtration media, used for removing solids accumulated during the filtration process.

Biological Oxygen Demand or Biochemical Oxygen Demand is a procedure, used in water quality management, for determining how fast biological organisms use up oxygen in a body of water.

Water with a level of salinity between freshwater and seawater, brackish water contains between 0.5 and 30 grams of salt per litre.

Construction Delivery Partner

Chemical Oxygen Demand – A water quality test that indirectly measures the amount of organic compounds in water (expressed in milligrams per litre).

Consultancy Service Provider

Removing and retaining suspended solids by means of their interception and adhering to grains or fibers (filtration media).

Defined as the difference in pressure between upstream (inlet side of the filter) and downstream (outlet side of the filter).

The Total Area of the Filter exposed to flow and usable for the filtration process.

Outflowing of water from a natural body of water, or from a human-made structure.

A device that removes particles from water by means of a physical barrier, chemical and/or biological process.

The total area of a filter element, usually expressed in square inches or square centimetres.

The process of removing solid particles from liquid or gas by forcing them through a porous medium.

The flow rate divided by the cross sectional area of the filter [m/hr].

Volume of water per unit of time.

Gallons per minute.

A thick layer of graded particles such as sand, gravel or other granular materials used to perform the filtration of a liquid. Multiple different layers of materials may be used to form the filter bed.

One millionth of a metre, equal to a micrometre.

Defines which part of the TSS (Total Suspended Solids) is relevant to the desired filtration degree; Number Density or Volume Density.

A measure of the acidity or alkalinity (basicity) of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at 25 degrees centigrade.

A channel or opening in a filter that allows the passage of fluid.

Water fit for consumption by humans and animals; it is also called drinking water. Water may be naturally potable or it may need to be treated in order to be safe.

Parts per million

Removal of coarse particles or large debris prior to a finer filtration process.

The preliminary treatment in the process of filtration (chemical or physical).

The force over an area applied to an object in a direction perpendicular to the surface; usually expressed in pounds per square inch (PSI) or bar.

Pounds per square inch

A device converting mechanical force and motion into hydraulic fluid power.

Intake water prior to any treatment or use.

Any natural or artificial holding area used to store, regulate, or control water.

Silt Density Index is a measure for the fouling capacity of water in reverse osmosis systems.
The test measures the rate at which a 0.45-micrometre filter is plugged when subjected to a constant water pressure of 206.8 kPa (30 psi)

The removal of organic matter from waste water in a sewage treatment plant using aerobic biological processes.

Solid particles in water that settle out over time.

The residual semi-solid material left from the filtration process.

Four layer media filter for potable/ clean water treatment.

Four layer media filter for industrial water treatment.

Four layer media filter for wastewater (waste water) treatment.

Four layer media filter for desalination pre-treatment.

All water naturally open to the atmosphere (rivers, lakes, reservoirs, ponds, streams, impoundments, seas, estuaries, etc).

Total Dissolved Solids

An expression for the substances contained in a liquid in a molecular, ionized or micro-granular suspended form. The operational definition is that the solids must be small enough to pass through a two micron filter. The term is used as an indirect reflection of water salinity. The term is also known as total filterable residue.

Advanced cleaning of wastewater that goes beyond the secondary or biological stage removing nutrients such as phosphorus, nitrogen and most BOD and suspended solids.

A human-made facility for the purpose of changing water quality.

Total Suspended Solids

The total Concentration of Dirt Load in water; measured in milligrams per liter or PPM (parts per million).

Measured in NTU (Nephelometric Turbidity Units) is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye. The measurement of turbidity is a key test of water quality.

The resistance of a fluid to flow caused by internal friction between the fluid molecules and intermolecular forces.

The spent or used water from a home, community, farm, or industry that contains dissolved or suspended matter.