Liquid Filter Bag Size #1 vs #2

Compare liquid filter bag Size #1 and Size #2, including housing compatibility, flow and dirt holding considerations, and what to confirm before requesting a quote.


Liquid filter bag Size 1 and Size 2 comparison diagram
Diagram comparing the general concept of a smaller Size 1 filter bag and a larger Size 2 filter bag, with a reminder to confirm actual dimensions.

Size #1 vs Size #2: confirm actual fit shorter longer
Size #1
Size #2
The diagram is conceptual. Confirm diameter, length, ring type, housing basket, and sealing area before quotation.
Technical illustration for comparison. Actual dimensions and construction may vary by housing and application.
Bag filter housings in a workshop for liquid filter bag size compatibility context.
Housing context image for filter bag size compatibility. Confirm actual bag dimensions and housing basket specifications before quotation.

Short Intro

Liquid filter bag size matters because the bag must fit the filter housing, support basket, and sealing area. Size #1 and size #2 are two common industrial filter bag size categories, but the size label alone is not enough for every application.

Before requesting a quote, buyers should confirm actual bag dimensions, ring type, housing compatibility, material, micron rating, and quantity.

For RFQ support, Go2Filter can review liquid filter bag specifications:

Request liquid filter bag support

What Do Size #1 and Size #2 Mean?

Size #1 and size #2 are commonly used names for liquid filter bag dimensions. They help buyers, maintenance teams, and suppliers identify the general size category of a bag used in a compatible housing.

However, size labels can vary by housing design, ring type, and manufacturer. Always confirm the actual diameter, length, and sealing style before finalizing a quote.

Typical Size #1 Filter Bag

A size #1 liquid filter bag is often used in smaller bag filter housings or lower-flow applications.

Typical characteristics may include:

  • Smaller bag volume than size #2
  • Shorter length than size #2
  • Common use in compact housings
  • Easier handling in smaller systems
  • Suitable where flow and solids loading are moderate

The exact dimensions should be confirmed from the existing bag, housing documentation, or supplier specification.

Typical Size #2 Filter Bag

A size #2 liquid filter bag is often used in larger single-bag housings and is one of the most common industrial bag sizes.

Typical characteristics may include:

  • Larger bag volume than size #1
  • Longer length than size #1
  • Higher solids-holding capacity than a smaller bag
  • Common use in industrial liquid filtration systems
  • Potentially longer service life where solids loading is higher, depending on process conditions

As with any filter bag, the actual fit must be confirmed before quotation.

Size #1 vs Size #2 Comparison

Factor Size #1 Size #2
General size Smaller Larger
Typical use Compact housings, lower volume systems Common industrial housings, higher volume systems
Solids capacity Lower than size #2 Higher than size #1
Handling Easier for small systems Larger bag volume and more media area
Fit requirement Must match housing and basket Must match housing and basket
Quote requirement Confirm dimensions and ring type Confirm dimensions and ring type

This comparison is general. It should not replace actual measurement or housing confirmation.

Housing Compatibility

Filter bag size must match the housing basket and top seal. A bag that is too long, too short, too wide, or fitted with the wrong ring type may not seal properly.

When checking compatibility, confirm:

  • Housing model or brand if available
  • Basket diameter and length
  • Bag diameter and length
  • Ring or collar type
  • Lid closure and sealing area
  • Existing sample photos

If the housing nameplate is available, include a photo when requesting a quote.

Flow Capacity Considerations

Size #2 bags are often selected when a system needs more media area or solids capacity than a smaller bag can provide. However, flow capacity depends on more than bag size.

Important factors include:

  • Liquid viscosity
  • Solids loading
  • Micron rating
  • Bag material
  • Housing design
  • Pump conditions
  • Allowable pressure drop

A larger bag may help in some applications, but it does not automatically solve every flow or plugging issue.

When to Use Size #1

Size #1 may be considered when:

  • The housing is designed for size #1 bags
  • The system has moderate flow demand
  • Space is limited
  • Solids loading is not excessive
  • Smaller batch processing is involved

The housing design is the first requirement. Do not switch to size #1 unless the housing is compatible.

When to Use Size #2

Size #2 may be considered when:

  • The housing is designed for size #2 bags
  • The system handles larger liquid volume
  • More solids-holding capacity is needed
  • Changeout frequency needs review
  • A common industrial bag size is preferred

Again, fit and sealing must be confirmed before use.

What Customers Should Confirm Before Requesting a Quote

To avoid fit problems, prepare the following:

  • Existing filter bag size label, if known
  • Bag diameter
  • Bag length
  • Ring or collar type
  • Material
  • Micron rating
  • Quantity
  • Housing model or photos
  • Application and liquid type
  • Operating temperature
  • Flow rate and pressure if known

Go2Filter quote link:

Send Your Filter Bag Specifications

Common Materials for Size #1 and Size #2 Bags

Size #1 and size #2 bags may be available in different materials, depending on application requirements.

Common material categories include:

  • Polypropylene filter bags
  • Polyester filter bags
  • Nylon mesh filter bags

Related Go2Filter pages:

FAQ

Is size #2 always better than size #1?

No. Size #2 is larger, but the correct choice depends on the housing design, flow rate, solids loading, and application. The bag must fit the housing.

Can I use a size #1 bag in a size #2 housing?

Usually no. Filter bags should match the housing and basket design. Using the wrong size can cause poor sealing, bypass, or mechanical problems.

Are size labels enough for a quote?

Size labels help, but dimensions and ring type are better. Photos of the existing bag and housing can reduce the risk of mismatch.

Does a larger bag always reduce pressure drop?

Not always. Pressure drop depends on liquid viscosity, solids loading, material, micron rating, flow rate, and housing design. Larger media area may help in some cases, but it is not a universal solution.

What if I only have an old filter bag sample?

Send photos and measurements of the sample, including the top ring, diameter, length, label, and seam style if visible.

Request a Quote on Go2Filter

For pricing, availability, shipping, and lead time, send your size, material, micron rating, quantity, and application details for review.

Send Your Filter Bag Specifications

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