The toxicity of chlorine is not always understood since it is consumed by the average household everyday, and some of us swim in it at relatively high concentrations. However, the lethal concentration of sodium hypochlorite (chlorine) to rainbow trout is approximately 0.2 mg/L and for the Daphnia Pulex the lethal dose is approximately 0.03 mg/L (Source: US Environmental Protection Agency). What does this mean? It means that a pool that has 2 ppm (mg/L) of chlorine could pollute a body of water 10-100 times its size if sent to the storm drain. Similarly, water main flushing programs could send 10,000 gallons or more at 0.2 ppm, per hydrant, to the environment. When sending these volumes of water to the storm drain, it is a very important matter that the chlorine be removed, and it's a simple procedure to use a dechlorination agent to remove that chlorine via tablet and liquid feeders or mats.
Comparisons
Available in granular and tablet forms, Vita-D-Chlor is a safe dechlorinating agent. Whereas chlorine itself is lethal for fish even at concentrations well under 1 ppm, and sulfite dechlorination scavenges oxygen, Vita-D-Chlor is healthy for fish and safe for the environment. The tablet form is an effective replacement of sulfite dechlorination tablets when fish bearing waterways may be affected by the discharge from a hydrant during water main flushing. Keep in mind that it is a weak acid, and large volumes of the chemical may affect the receiving water's pH. In this case, consider sodium ascorbate which has all the benefits of ascorbic acid without the adverse effects of a low pH. You can read more about vitamin C dechlorination in this helpful report from the US Forest Services.
Usage Information
Use the calculator below to find if Ascorbic Acid (Vitamin C), or another chemical provided by PromagEnviro.com is right for your application. Actual results may vary:
Applications
Dechlorination chemicals are used whenever tap water or other chlorinated water is discharged to a storm drain or near creeks, streams, ponds, rivers, lakes, oceans or ground water. These are some typical applications where dechlorination is needed:
Hydrant flushing
Swimming pool drainage
New main installations, maintenance and repairs
Reservoir, water tank or well cleaning
Wastewater effluent release
Reservoir overflow
Municipal parks swimming pool drainage
Fire flow testing
Filter backwash
Dewatering
Highly chlorinated water release to wastewater treatment plant
Permit compliance and Emergency situations.
Further Information
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