ProWeigh® filters from Environmental Express are a time-saving, convenient and accurate way to perform Total Suspended Solids. By eliminating all the required filter preparation steps necessary for solids determination, the hands-on time required for performing TSS is reduced by half.

The 20th edition of Standard Methods, the definitive book of water and wastewater test methods, lists ProWeighs from Environmental Express by name. Method 2540C, Total Dissolved Solids Dried at 180°C; Method 2540D, Total Suspended Solids Dried at 103-105°C; and Method 2540E, Fixed and Volatile Solids Ignited at 550°C all specifically list ProWeighs as an acceptable filter. ProWeighs were approved for use by the Standard Methods committee in 1997. To use ProWeighs, simply remove one from its pan, place it on a filter funnel and filter your sample. After filtration is complete place the ProWeigh filter back in its pan and dry in an oven for the final weight determination. All the washing, drying and preweighing is done for you.

Download a brochure on the benefits of ProWeigh Filters

PreWashed
All ProWeigh filters are vacuum rinsed with three aliquots of deionized water. This step removes any loose fibers which could affect the filter's constant weight. The filters are then dried at 105°C in mechanical convection ovens, cooled and dessicated for 24 hours.

PreWeighed
Filters are weighed on electronic analytical balance to the nearest 0.1mg. Balances are self-calibrating and are checked with in-house Class S weights. Our balances are also routinely certified by an outside party. A copy of the balance certification is included in each box of ProWeighs.

PreLabeled
ProWeighs are supplied in individual aluminum pans labeled with the weight of the filter affixed with a Mylar label. In addition to the filter weight, the label also displays an individual sample number. This information is also shown in a 128 bar code format. Our automatic labeling system prevents the transcription errors that can occur in the laboratory.

Download a cost calculation form to see if purchasing ProWeigh filters will not only save time and labor, but also money.



Find an article published in Lab Instrumentation Trends Magazine in the NEWS section at the top, along with a copy of EPA Method 160 for TSS.
ProWeighs-Click here for Suspended Solids-Unequal Results from Equal Methods