Bag filters are used for sediment removal in a number of applications. Water flows from the inside to the outside of the bag, and particles are captured on the internal surface of the filter bag media for quick and easy disposal. Filter vessels are available in all construction materials and can handle flow rates from 1 to 400 GPM.

Filter Bag Media

Filter bag media is extremely durable, can maintain high flow rates, and is available in various felts (micron ratings from 1-200) and mesh materials (micron ratings from 10-800) to meet all of your chemical and thermal needs.

Bag filters are primarily surface-type filters, and are well-suited to flows with solids concentrations of greater than 5 mg/m3. Surface-type filters can be backwashed and easily cleaned. This is in contrast to depth-type filters, which normally have to be disposed of when clogged.

Bag filters are typically designed for applications with a desired filtration rate of 1 to 1000 micron. Note the distinction between absolute and nominal filtration rate:

Absolute filtration rate indicates the maximum size of a particle that can pass through the filtration unit.

Nominal filtration rate indicates the real size at which materials pass through the filtration unit, accounting for the fact that a certain percentage of materials larger than the nominal filter rating will be able to pass through. The % efficiency rating (e.g., 98%) of the nominal filtration rate indicates the amount of larger particles that will be successfully blocked by the filter.