BWT Organic 4

BWT Organic 4 – Oxygen Scavenger – Low & Medium pressure marine boiler systems

BWT Organic 4 is an environmentally safe oxygen scavenger based on neutralised organic acids and volatile amines.

It removes oxygen from feed-water as well as forming an organic iron compound on steel surfaces. It will also protect copper surfaces.

BWT Organic 4 can be used in low and medium pressure systems.

Directions for Use

BWT Organic 4 should be dosed to give a pH of 9.0-10.0 in the condensate returns.

If hot-well temperatures are maintained above 80⁰C a condensate pH range of 9.0-9.5 should be sought, if temperatures are lower than this then condensate returns should be maintained at a pH between 9.5-10.

Dose Rate

An initial dose rate of 0.2 Litre/m³ of boiler water should be used.

This can be increased to 0.7 Litre/m³ for systems showing signs of corrosion for a few days.

BWT Organic 4 should be dosed continuously via a metering pump directly into the feed system or the exhaust gas economiser circulating pump discharge. BWT Organic 4 MUST NEVER BE SLUUG DOSED to a running system via a hot-well or by-pass feeder.

Pack Size 25 Litre

Aquamarine Product Comparison

Boiler Water &
Condensate Treatments
Liquid Boiler Water
Treatment Extra
Liquitreat AGK 100
Condensate Controller Condensate
Boiling Out Compound
Hardness / Phosphate
Hardness Control Adjunct B
Sulphite Oxygen
Cat Sulphite CSL (Liquid) Catalized Sulphite (Powder)
Boiler Coagulant Boiler Coagulant Liquid Coagulant
Alkalinity Controller Alkalinity Control GC
Combitreat B.W.T. POWDER
Autotreat Drewplex AT
Oxygen Scavenger Plus Drewplex OX
Engine Water &
Evaporator Treatments
Corrosion Controller CWT Rocor NB Liquid LIQUIDEWT, MAXIGUARD
Corrosion Controller
Aluminium Corrosion Controller CWT XLICooltreat AL & Engine Water Treatment 9-111AL XLI
Universal Antifreeze + Test Meter
Evaporator Scale
Evaporator Scale
Biological Growth
CW25B Chilled Water
Plant Treatment
Cleaning & Maintenance Products
Aquawash – General Purpose Degreaser & Ultrasonic Cleaning Fluid Aquabreak PX Edge
QuickBreak – Solvent Engine Room / Bilge Degreaser Cleanbreak DREWCLEAN 2000, AMEROID OWS
Fast Dry Electrical Cleaner Electroquick NF Drew Electric 2000
Carbon Remover – Combined Air Cooler Cleaner Carbon Remover Carbon Remover
ACC Plus ACC Plus
Air Cooler Cleaner / ACC Air Cooler Cleaner ACC-9, ACC/ME
De-scaling Powder Descalex Saf acid
Diesel Engine Cooling Water Inline Cleaner
Rust Remover &
Purifier Disc Cleaner
Disclean Ameroid DC
Natural Zest Cleaner Enviromate 2000
Aqua-Potable Water
Red Rust Treatment
Potable Water
Descaling Liquid Descaling Liquid DESCALE IT
Oil Spill Dispersant – Type 1 Seacare O.S.D. OSD/LT
Approved Type II & III OSD High Performance Oil Spill Dispersant Seacare Ecosperse DREWCLEAN EOSD
Tank Cleaner H.D. Tankleen plus, Seaclean TC#4
H.D. Cement Descaler
Aqua Engine Mate (750ml Spray)

Sulphite Oxygen Controller

Sulphite Oxygen Controller

SULPHITE OXYGEN CONTROLLER is a liquid sodium sulphite product used for oxygen scavenging in low and medium pressure marine boilers.

How does it work?
SULPHITE OXYGEN CONTROLLER reacts rapidly with dissolved oxygen in the boiler to form inert sodium sulphate. this prevents damage caused by oxygen pitting and corrosion in the boiler. Oxygen Scavenger is a convenient to use liquid oxygen scavenger recommended for the complete removal of oxygen from deaerator heaters, feedwater storage areas, feedwater lines, ship condensate return lines, boiler internals and closed recirculating water systems.
The product is dosed to give a reservoir level of sodium sulphite in the boiler. If the reserve drops below a minimum level then oxygen corrosion will occur. It is therefore essential to maintain a level at all times. The product is used as part of a boiler water treatment programme.


Results of use
The interior of the boiler is protected from oxygen corrosion attack. However please note that extra solids are produced in the process so additional blow-down will be required.

Dosing and Sampling
A reserve of 30-50ppm sulphite (Aalborg recommend 30-60 p.p.m) should be maintained in the boiler. SULPHITE OXYGEN CONTROLLER should be dosed continuously to the boiler by means of a metering pump into the feed line after the recirculation line. Continuous dosing can also be achieved by dosing into the hotwell to a point as close to the feed water pump suction as possible, although efficiency is adversely affected by low hotwell temperatures.

A representative sample of boiler water must be obtained, at an interval set by experience in operation of the boiler. The sample should be taken after the regular blow down and analysed immediately. The target usage is 30-50ppm of sulphite. The product should be applied separately to CONDENSATE CONTROLLER and should not be mixed with any alkaline treatment.

18 p.p.m of Oxygen Scavenger are required for each p.p.m of dissolved oxygen, plus a slight excess residual for testing purposes.
Dose per M³ feed = (18 x p.p.m Oxygen) + (________65__________)
Boiler concentration factor

This formula will give 30 p.p.m sulphite as Na²So³
Where Feed temp = 80°C then p.p.m Oxygen = 2.9 p.p.m

Oxygen Scavenger liquid may be fed directly from the shipping container or diluted with clean condensate in a chemical mix tank. It is compatible with most boiler chemical additives except filming amines. Minimum agitation is suggested to prevent premature activation of the oxygen scavenger with oxygen (air) captured by mechanical action at the solution interface. Covered mix tanks or floating plastic plugs are desirable. It may be dosed in conjunction with Liquid Boiler Water Treatment PLEASE TAKE SPECIAL NOTE: DO NOT ADD NEAT LIQUID BOILER WATER TREATMENT AND SULPHITE OXYGEN SCAVENGER TOGETHER. Typically the neat sulphite Oxygen Scavenger should be added to pre-dilute Liquid Boiler Water Treatment in a mixing tank. A typical mix would be for a 100 litres of pre-mixed treatment: 75 litres water, 25 litres Liquid Boiler Water Treatment and 3 litres of Sulphite Oxygen Scavenger.

Oxygen Scavenger is controlled by maintaining a fixed sulphite excess of not less than 30 p.p.m in boilers or 3 p.p.m in feedwater lines, as detectable sulphite using a reagent dropper method or standard titration technique. Aalborg recommendation is 30 -60 p.p.m. Please check specific manufacturer’s instructions as they may vary.

Avoid direct contact with skin and eyes to prevent mild irritation. In case of accidental contact, flush area with water, and seek medical attention. Product should not be ingested. Please refer to Material Safety Data Sheets for detailed handling and storage information.

SULPHITE OXYGEN CONTROLLER is an catalysed sulphite oxygen scavenger used as part of a boiler water treatment programme in low or medium pressure boilers.

Pack Size – 25 litre Drum.
NSN J150-6810-99-378-4863 Product Ref. 0055