CW-L20-C is a unique and specialized mildly alkaline nitrite-based corrosion inhibitor for closed water circuits. It is available in a liquid and in a solid form (CW-S80-C). It contains the corrosion inhibitor, an internal indicator, a biocide and a hardness management compound. In its neat form the indicator is used to confirm that the product is suitably alkaline and when controlled at the required levels the indicator will reveal whether the pH in the circuit is adequate. At the required control limits the pH will not increase so as to affect amphoteric metals such as aluminium and zinc compounds harshly.


:Crimson Liquid
pH neat soln. at 25°C
:8.50 – 10.50
Specific Gravity at 25°C
:1.10 – 1.15


CW-L20-C is nominally dosed at between 2500-3000mg/l in the closed water system to maintain a residual as nitrite at between 300 – 400mg/l as well as an effective biocide residual. In chilled water circuits hardness salt precipitation is not highly problematic, however, in hot water circuits this may prove otherwise.

The initial dosage is the most critical. Thereafter water losses in chilled/cold closed water circuits is estimated to be between 8% to 12% per month; whereas, in closed hot water circuits the water losses average between 8% to 12% per week. Based on this and routine water analyses the CW-L20-C can be supplemented to the circuit as required.

There is a specific test method for the determination of the residual BCI-L20-C and/or the residual nitrite level. This is a titrimetric/colorimetric method and is immediately available.

CW-L20-C is also available as a spray dried powder – CW-S80-C and can be diluted to 25% m/m. The dosages and residuals can be controlled exactly as described above. Alternately the powder can be added to a recirculating system via the expansion vessel at 625 – 700 mg/l to maintain similar nitrite residuals. Product supplementation will be dependent upon the respective system water losses in each case.

Innovation: It’s part of our DNA

Large enough to deliver. Small enough to care.

Innovation is everywhere at Blue Reef. For example, the chemical products which we have produced for the anti-scalent market are unique in every way. Our “HEXAMER” based products are formulated and manufactured employing processes previously never used in the manufacture of water treatment products.
Not only does this make the products far more stable than traditional inhibitors, but one is able to actually test for the active aspect in the product. This takes scale inhibition and scale removal to a new level in that chemical dosing rates can be calculated very accurately resulting in cost savings and increased efficacy.

A further innovation is that all of our products are available in liquid and dehydrated powder form. These dry products are unique. All that one has to do to produce a liquid version of the same product is to “JUST ADD WATER” and mix.

This makes for transportation of product over long distance/over border logistics extremely easy as packing for transportation is far easier and so much safer.

Blue Reef Water Solutions (Pty) Ltd
Reg: 2013/149985/07
2096 Prince Mcwayizeni Road, Reunion, Durban
PO Box 32079, Mobeni, 4060, KwaZulu-Natal, South Africa

E-mail: | Telephone: +27 31 910 7500 | Fax: +27 31 910 7510