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Sodium Thiosulfate commonly used in Dechlorination of municipal wastewater, pulp & paper, power, and textile water treatment plants and as an Oxygen scavenger in oil well drilling process in Mining industries. Also chemically suitable for Aluminium cation reaction.
Sodium Thiosulfate used as a Pond / Aquarium Dechlorinator. But Sodium Thiosulfate does not treat for Chloramine, only Chlorine. Chloramine is a chemical compound composed of chlorine and ammonia and more and more utilities are converting to its use. Check with your municipal water company to learn which chemical they are using. If Chloramine is the disinfectant, please research other knowledgeable sources to learn your best solution for water treatment.
Molecular Formula ::: Na2S2O3 - 5H2O
This product also used as a Photography as a fixing agent (hypo) to dissolve unchanged silver salts from exposed negatives.
Sodium Thiosulfate Anhydrous can be used for:
Ballast water dechlorination
Residual chlorine neutralization
Electrochlorination BWMS
Sodium hypochlorite-treated ballast water
Oxidizing biocide neutralization
Ballast water discharge preparation
Marine water-treatment systems
Sodium thiosulfate functions as a reducing agent. It reacts with residual oxidizing species and converts them into less oxidizing chemical species.
In a chlorine-treated ballast water system, sodium thiosulfate can consume residual chlorine, helping reduce the Total Residual Oxidant (TRO) concentration before discharge.
The required dosage depends on:
Initial TRO concentration
Ballast water volume
BWMS technology
Water chemistry
Required discharge residual
Chemical concentration
Reaction/contact time
Dosing-system configuration
Therefore, dosing should be calculated based on the actual BWMS operating parameters rather than using a universal fixed dosage.
The required quantity of Sodium Thiosulfate should be determined from the actual TRO measurement and BWMS dosing requirements. Overdosing or underdosing can affect ballast-water treatment performance and discharge conditions.
For shipboard operation, dosing should therefore be controlled through the vessel's approved BWMS procedures, TRO monitoring system, and chemical-dosing equipment.
Many Ballast Water Management Systems (BWMS) use an oxidizing treatment process to control organisms in ballast water. Depending on the technology, treatment may generate or introduce free chlorine, hypochlorite, or other oxidizing residuals.
Before discharge, residual oxidant may need to be neutralized.
Sodium Thiosulfate Anhydrous can be dosed into the treated ballast water to reduce residual oxidizing compounds.
This makes it an important chemical for selected ballast-water neutralization systems.
Because the anhydrous grade does not contain water of crystallization, it provides a higher chemical concentration by weight compared with hydrated grades.
It is widely used as a reducing agent for residual chlorine and hypochlorite neutralization.
The solid can be dissolved in water to prepare a dosing solution suitable for compatible chemical dosing systems.
Sodium thiosulfate is used in selected marine and ballast-water treatment applications where residual oxidants must be neutralized before discharge.
Sodium thiosulfate is available in different hydration states.
Sodium Thiosulfate Anhydrous:
Na₂S₂O₃
Sodium Thiosulfate Pentahydrate:
Na₂S₂O₃·5H₂O
The two grades should not automatically be substituted on a kilogram-for-kilogram basis because their molecular weights and active chemical concentrations differ.
When changing between grades, the dosing calculation should be adjusted according to the required molar or active-chemical concentration.
Sodium Thiosulfate Anhydrous should be stored in a cool, dry and well-ventilated location in tightly closed packaging. Protect the product from moisture and contamination.
Appropriate personal protective equipment should be used during handling and preparation of dosing solutions. Always consult the latest Safety Data Sheet (SDS) and the BWMS manufacturer's operating instructions.
Sodium Thiosulfate Anhydrous is an important reducing chemical for selected ballast water treatment systems, particularly where chlorine or other oxidizing disinfectants are used. Its ability to neutralize residual oxidants makes it valuable for ballast water dechlorination and discharge preparation.
For marine operators requiring Sodium Thiosulfate Anhydrous for Ballast Water Treatment, a consistent-quality product, correct dosing calculation, proper storage, and compatibility with the vessel's BWMS are essential for effective and compliant operation.