TECO Cool Treat NCLT
TECO COOLTREAT NCLT is a specially formulated liquid corrosion and
scale inhibitor for closed circuit cooling water systems.
Features & Benefits-
• Easy to use, easy to dose, liquid cooling water treatment
• Highly effective anodic inhibitor treatment, protects ferrous and non-ferrous metals
• Deposits a microscopic protective film on surfaces • Built-in pH buffering compounds
• Approved by major engine manufacturers
• Controls formation of hard scale deposits
• Will not damage seals, glands, packing, hoses and gaskets
• Compatible with all types of glycol based antifreeze
• Prevents cavitation or erosion
• Simple to test and control
• Can be used in all types of closed cooling water systems
TECO COOLTREAT NCLT is a nitrite, borate and organics based corrosion inhibitor suitable for all
types of engines and other closed recirculating water systems.
Directions for use
Determine the quantity of treatment required for the system from the product dosage chart. TECO
COOLTREAT NCLT should be dosed to the system by means of a TECO CHEMICALS dosing pot. The
dosing position should be where the circulation is at the highest. Do not add to expansion tank if there is
little or no circulation.
Systems contaminated with oil and/or scale should be cleaned before applying TECO COOLTREAT
NCLT treatment. Use MarClean H60+ for degreasing and TECO DESCALING LIQUID
EXTRA for descaling operation.
Water quality is one of the most important issues in today’s treatments. Always use good quality
demineralized water. Under no circumstance should cooling water be mixed with shore water or potable
Shore water or potable water has far too many impurities like silica, bicarbonates and other minerals that
can cause scale and corrosion to the cooling water system. In order to treat the closed cooling water
system it is vital to use nothing but demineralized/evaporator water, or reverse osmosis water.
Dosage and Control
The effective control range of TECO COOLTREAT NCLT is 1000 ppm of NO2 . To maintain adequate
reserves, we recommend a nitrite reserve of 1500 ppm. The nitrite level should not be allowed to fall
below 1200 ppm. Initial dosage is 10.3 l of NCLT for every ton of cooling water. Maintenance dosages
are based on the nitrite concentration shown in the product dosage chart.
The condition of the cooling water treated with TECO COOLTREAT NCLT, should be within the following
Nitrite: 1200 - 1500 ppm
Chloride: Below 100 ppm Cl
Hardness: Below 180 ppm CaCO3
pH: 8.3 - 10
Use the TECO CHEMICALS TEST KIT NITRITE to determine the TECO COOLTREAT NCLT level. If
there are no leaks and an apparent drop in nitrite value is observed in the system, this could be due to
bacterial contamination. Contact your TECO CHEMICALS representative for assistance.
All competitors nitrite/borate-based water treatments are compatible with TECO COOLTREAT NCLT, but
allow old product to drop to lowest limit before dosing the TECO CHEMICALS product. It is only
necessary to drain the cooling water when the competitor’s product has a colour coder, or pH colour
changer in it.
Note: TECO COOLTREAT NCLT will slowly remove sludge and other residues during the first period of
operation. This can result in cloudy water, which will clarify after blowing down small quantities of water.
Please consult your TECO CHEMICALS representative for the correct procedure of changing to TECO
TECO COOLTREAT NCLT is usually available in plastic cans of 25 l and plastic drums of 200 l.