Metabisulfito de Sodio

Metabisulfito de Sodio

Agente reductor para la eliminación de cloro

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In order to reduce the residual toxicity of chlorine and its combined compounds which are present in drinking water or used for disinfection purposes, there are effective compounds such as sulfur dioxide, sodium bisulfite and sodium metabisulfite (the latter being the most commonly used due to its simplicity).

Sodium metabisulfite is a colorless powder with a slightly spicy smell, whose ingestion has harmful effects. Contact with acids or oxidizers should be prevented.

Its chemical formula is Na2 S2 O5. Dosage is applied in precalibrated proportions depending on the type of water to be treated, as indicated in the following equations:
S 2 O 5 Na 2 +2CI 2 +3H 2 O 2 NaHSO 4 +4 HCI
3 S 2 O 5 Na 2 +2 NH 3 +6 Cl 2 +9 H 2 O 6 NaHSO 4 +10HCI+2NH 4 CI


Sodium metabisulfite is mainly used for removing chlorine, since it is extremely aggressive towards reverse osmosis membranes by degrading them (polyamide or polysulfone membranes) and, at the same time, it also reacts with chloramine (a compound that has been classified as a carcinogen by the FDA).

It is a very effective reducing agent and its correct dosage in reverse osmosis systems acts as a substitute for the activated carbon filters used for the adsorption of many chlorinated compounds. The maximum allowable limit of sodium metabisulfite in the water stream is 0.2 ppm.

The chemical reaction results in the production of sulfates, which are retained in the dual stage microfilters or multistage filters, together with any other suspended particle that might damage the osmosis membranes.

Contact Information

You can place your order by telephone, e-mail or fax. If you require a price quote for our products, please fill in our quotation form.

Customer service:
Tel: +54 223 482-7000 (and rollover lines) - 0800 666 3489