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21T Series Lab Filter

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21T Series Lab Filter

The 21T Series lab filter is for use in laboratories to perform filtration trials and scalability studies. These units are constructed of 316 stainless steel with stainless steel cylinders for pressures up to 50 PSIG, or a protected Pyrex® glass cylinder for filtration up to 30 PSIG. Stainless steel cylinders can be furnished with an optional heating or cooling jacket.

When running trials, which require more than one filtration stage, ErtelAlsop offers an optional dividing flange. This option can be supplied with the filter or at a later date without any modifications to the original system. This design allows for an infinite number of filtration stages.

Small constant flow pumps, compressed air or inert gas can be used to flow liquid through the filter media. The O-Ring seal provides the versatility to use a variety of filter media of different composition and thickness.

ErtelAlsop offers a full line of Cylinder Type Laboratory Filters with capacities up to 8000 ml.

Standard Features

  • Stainless Steel Cylinder (model 21T)
  • Pressure Gauge
  • EPDM Elastomers
  • Stainless Steel Mounting Stand


  • Small Batch Botanical Extraction
  • Research & Development
  • Quality Assurance

Optional Features

  • Pyrex® Glass Cylinder (model 21TP)
  • Heating or Cooling Jacket (model 21TJ)
  • Single Sheet / No Reservoir (model 21TS)
  • Sanitary Connections
  • Dividing Flanges
  • Tubing and Pumps
  • Elastomer Material – Teflon, Neoprene, Viton, Buna, Silicone

Product Testing

Product testing is always available either at your facility or at our in-house laboratory*.

* In-house testing is subject to approval by CLEAR Solutions.

Pilot Testing – Rentals

For in-plant testing and scale-up procedures, ErtelAlsop offers a variety of lab filters for rent. A portion of rental fees can be applied to the purchase of your full production filter.


21T Series Lab Filter Drawing

Spec Sheets

Product Specifications

Gasket MaterialEPDM
Pressure Limit50 PSI
Jacket PressureN/A
Media TypeAny Flat
Media Diameter5.51 in (140 mm)
Filter Area21 in2 (135.5 cm2)
Volume228.84 in3 (3,750 ml)
Gauge0 – 2.5 Bar

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