ProWeigh Double for TSS/VSS

*ProWeigh Double for TSS/VSS

ProWeigh® Double Filters are 1.5µm Binderless Glass Fiber Filters for Total and Volatile Suspended Solids with all preparation steps done for you.

The interpretations by various auditors of the requirements of prepared filters for TSS and VSS analysis often differ from one regulatory body to the next. ProWeigh® Double filters from Environmental Express strictly document ALL preparation steps outlined in Standard Methods 2540D and E for prepared filters. ALL preparation steps are done for you.

Lasercut binderless glass fiber filters are:

  • Washed 3 times with deionized water
  • Dried at 103 - 105°C (ProWeigh Double filters for Volatile Suspended Solids are then ignited at 550°C for 15 minutes)
  • Weighed to 0.1mg
  • Re-dried or re-ignited at the appropriate temperature, and
  • Reweighed to 0.1mg
  • Placed in aluminum weigh pan

Pans are labeled with weights in print and barcode formats.

As an added convenience, complete data for each box of 47mm ProWeigh Double filters is available on our website! To access your ProWeigh Double Data, simply go to our website, http://www.envexp.com/filterdata and type in your Box ID number (found on the product label on your box). The product data for all the filters in your box is populated on your computer screen.

Download your data into a CSV/Excel file with just one click. It's as simple as that. Your DoubleWeigh data will be stored in our system indefinitely. Access your data any time.

Click here for an article about the benefits of using ProWeigh filters.

To determine time and cost savings in your lab by switching to ProWeigh, you can download our ProWeigh Cost Calculator.

Download a brochure on the benefits of DoubleWeigh Filters.

DoubleWeigh Filters for TSS

Item No. Description
F93447MM-X DoubleWeigh Filters for TSS, 47mm, 100pk
F93476MM-X DoubleWeigh Filters for TSS, 76mm, 100pk
F93490MM-X DoubleWeigh Filters for TSS, 90mm, 100pk

DoubleWeigh Filters for VSS

Item No. Description
F93447VOL-X DoubleWeigh Filters for Volatiles, 47mm, 100pk
F93476VOL-X DoubleWeigh Filters for Volatiles, 76mm, 100pk
F93490VOL-X DoubleWeigh Filters for Volatiles, 90mm, 100pk


Is there a right/wrong side to use these filters?

Standard Methods says that the filters should be used ‘wrinkled side up’. On our filters you can see the imprints of the mesh screen that we use to support the filters during the washing step. This is the ‘down’ side.

Ohio EPA requires certified weights to verify the accuracy of the balance, do you think checking the weight of a Double Weigh filter could be an approved substitute for the certified weights?

Our DoubleWeigh filters are not certified weights and cannot be used to calibrate balances. You will need to use a certified weight set to calibrate your balance prior to use for solids testing.

Are double weigh filters returned to oven after the determination of first weight for second drying cycle?

Yes they are. The pans are printed with only the first weight on the label. Both weights are available by entering your box or filter ID at http://www.envexp.com/filterdata

Which weight is most accurate and should be used?

Standard Methods does not specify which weight should be used once the preparation of the filters is completed. Some laboratories use the first weight and have the second weight merely as a verification of stability. Other laboratories use the second weight as that is the most recent weight reflective of the final condition of the filter. Your laboratory SOP and the direction from your accrediting body should give you guidance on which weight to use.

Hi there, what is the price on the 47mm Double weighs?

All of our pricing is available online by logging into your customer account. If you need help setting up or accessing your account please call our toll free number 1-800-343-5319 and speak with our customer support team.

what is the effective pore size of these filters?

These are binderless, glass fiber, 1.5 micron filters as specified in the methods for total suspended solids.

Click on an item to see additional information or ask a question.