Last updated: 14/01/2026 12:38:47
RO BISULPHITE 25 LTR LIQUID 38-40%
Product Code
- Product group:
- 672
- Product number:
- 777852
Preserve and Protect Your RO Membranes with RO Bisulphite RO Bisulphite is a solution of sodium hydrogen sulphite (sodium bisulphite) designed for the preservation of RO membranes and as an effective de-chlorinating agent.
Product information
This product supersedes product no: L770007
Why Choose RO Bisulphite?
Choosing RO Bisulphite is a smart way to preserve and protect your RO membranes. This solution of sodium hydrogen sulphite (sodium bisulphite) is specifically designed for effective de-chlorination and membrane preservation, ensuring your RO system operates efficiently and reliably.
Invest in RO Bisulphite today to maintain the longevity and performance of your RO membranes.
Features
Liquid Product: Easy to handle and apply, ensuring efficient use. Versatile Use: Suitable for both RO membrane preservation and dechlorination.
Benefits
Maintains RO Performance: Helps to keep your RO system running efficiently by preserving membrane integrity and removing chlorine. Concentrated Formula: Provides effective results with a concentrated solution, ensuring cost-efficiency. User-Friendly: Easy to handle, making maintenance tasks straightforward and efficient.
Specification
General
| Invent Hazard Material (IMO/EU) classification | C-9 |
|---|
Physical properties
| Density [g/ml] | 1.30 to 1.34 |
|---|---|
| Form | Light yellow liquid |
| Odour | Strong sulphur |
| pH | 3.7-4.5 |
Approvals
- Approved by The Norwegian Food Safety Authority
Safety Data Sheet (SDS)
Documents
Directions for use
Procedures
A. De-Chlorination
If the feed water to the RO system contains free chlorine it must be removed otherwise it can breakdown the RO membrane. NALFLEET™ RO Bisulphite is a 40% solution of Sodium Bisulphite (NaHSO3) It undergoes the reaction below with free chlorine:
2NaHSO3 + 2HOCl → H2SO4 + 2HCl + Na2SO4
A dose rate of 3.66ml/m3 of NALFLEET™ RO Bisulphite should be applied for each 1ppm of free chlorine in the feed water. Use a suitable free chlorine test kit to monitor reduction in free chlorine levels. For continuous applications a suitable storage tank and chemical dosing pump should be used.
The solution should be dosed as close to the RO system as possible (to keep as much of the pre-treatment as possible in contact with chlorine e.g. after the cartridge filters). However, if the free chlorine level is high, the solution should be dosed prior to the antiscalant injection point (or antiscalant dosage adjusted to compensate for chlorine attack, as some antiscalants are attacked by free chlorine). The antiscalant and NALFLEET™ RO Bisulphite dosing point should be far enough apart to prevent neat product mixing.
B. Lay up and preservation of Reverse Osmosis and Nano-Filtration membranes and systems. (Polyamide, TFC, CPA membranes)
It is necessary to preserve membranes when the RO or NF system is taken out of production for more than 24 hours. Failure to do so may allow biofilms to form on the surface of the membranes which will cause operational problems upon restarting the system.Prior to shutdown, the RO needs to be cleaned in-line with operational guidelines and MUST be flushed with RO permeate. After flushing with permeate, the preservation solution can be pumped into the RO system. Note: It has to be verified that the plastic materials (including pressure vessels) used in the membrane plant are resistant to sodium bisulphite. Otherwise cracks might occur in the plastic materials.
- Prepare a solution of 2.5 % NALFLEET™ RO Bisulphite
- Fill the entire system to be preserved with the solution
- It is recommended to measure the pH regularly. A fresh solution is needed when the pH < 3 A fresh solution is also needed when the liquid becomes turbid or changes colour. Regular inspections (weekly) are recommended.
NALFLEET™ RO Bisulphite conforms to the requirements of NSF/ANSI Standard 60 - Drinking Water Treatment Chemicals - Health Effects.
