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 Thio-Red Toxicity Info
Recent Acute Toxicity Test Results Show TR-6 & TR-50 Precipitants much less toxic than DTC.

Acute toxicity tests were recently performed on Water Specialists Technologies TR-50 and TR-6 precipitants by an independent ecological laboratory. 

These precipitants were tested for LC50 values, which means the concentration of the precipitant that is lethal to 50% of the exposed organisms.  For these tests, the organisms used included Pimephales Promelas (fathead minnow), Ceriodaphnia Dubia (water flea) and Daphnia Magna (water flea).

In summary, the report shows the following LC50 values after 48-hour static acute toxicity tests:
FISH                                                        TR-50            TR-6             DTC-40%*
Daphnia Magna (water flea)                        56.0 ppm       5.89 ppm      1.50 ppm
Ceriodaphnia Dubia (water flea)                   56.0 ppm       2.99 ppm       NT
Pimephales Promelas (fathead minnow)      15.8 ppm       10.3 ppm       NT
        *Previous test results.  NT = not tested.
Copies of the detailed report are available upon request.

Previous toxicity tests comparing Sodium Dimethyldithiocarbamate-40%(DTC) to WST THIO-RED precipitant resulted in the following LC50 values after 48-hour static acute toxicity tests:
FISH                        THIO-RED                 DTC-40%**
Rainbow Trout           33.0 ppm                 <0.10 ppm
Bluegill Sunfish         35.0 ppm                  <0.18 ppm

**For corroboration on the toxicity of DTC to fish, go to www.watertechonline.com - select LEGAL BRIEFS -then JUNE 2001 -then Firm Agrees to Pay Millions in Water Case 6/20/2001.

The bottom line is that DTC is considerably more toxic than THIO-RED, TR-6 & TR-50.  Click here to request information and free samples of these safe-to-use products.  Do your own jar tests to assess their effectiveness in removing the most challenging hard-to-remove metals from your wastewaters.