SCALE REMOVER LIQUID is a liquid acid containing corrosion inhibitors, wetting agents and surface tension reducing agents. The inhibitors prevent attack of the base metal after solution of heat exchanger deposits is complete. This product is suitable for removal of calcium carbonate and magnesium salts as well as ferrous oxides from metal surfaces. SCALE REMOVER LIQUID acts quickly and effectively even in hard conditions without heating.

Application
SCALE REMOVER LIQUID is recommended for descaling boilers, evaporators, condensers, heaters and coolers. It may also be applied for scale removal from steam pipes and air conditioners.

Use and dosing

SCALE REMOVER LIQUID can be used by all conventional methods. However, recirculation and soaking methods have proven to be most efficient.
First of all, inspect the components to be cleaned and if they are contaminated with oil, sludge or any other similar product, use either DEGREASER HEAVY DUTY or SPECIAL STEP No1 as pre-cleaners. The amount of SCALE REMOVER LIQUID to be used depends on the extent and nature if contamination. For general cleaning , use a solution of 10-30% of SCALE REMOVER LIQUID in fresh water.
Remember that SCALE REMOVER LIQUID is an acid so you should always pour acid into the water and never do the reverse!Once cleaning is complete, rinse thoroughly with plenty of fresh water and also rinse with a solution of 1-2% of CHEMALK in fresh water. This step is necessary to make steel surfaces passive and to neutralize any remaining acid.

RECIRCULATION METHOD
HEAT EXCHANGERS, EVAPORATORS, CONDENSERS
Heat a 10-30% solution of SCALE REMOVER LIQUID in water for best results (up to 50°C). Recirculate the solution through the heat exchanger by means of a pump for at least 6-10 hours and maintain solution temperature if possible. Periodically test solution strength and add SCALE REMOVER LIQUID as required. Rinse off by connecting the heat exchanger to a supply of fresh water. The last step involves circulation of a 1-2% solution of CHEMALK for a minimum time of 3 hours or until a neutral pH is obtained.
COOLING WATER SYSTEMS
Follow same procedure as above. A sufficient quantity of chemical will be required to maintain acid strength throughout the cleaning operation. Place scale samples in easy observed positions to monitor the progress.

BOILER SCALE REMOVER
Prepare a SCALE REMOVER LIQUID solution in a mixing tank (no more than 60-70 oC) and either arrange gravity feed of the solution directly into the boiler or connect the mixing tank to the circulation line between the water blow down flange and the pump. Use auxillary feed line to feed the solution into the boiler so it flows via the economizer to the steam drum and then to the water drum, through the boiler tubes and subsequently out of the blow down connection. Secure all connections, half fill the boiler with fresh water and slowly add the product to obtain a solution of 10-30% and then start the circulation pump. Maintain the circulation for 8-16 hours, making sure that the acid strength of the solution remains stable by checking periodically and adding product as required.
Periodically test the solution strength. If it quickly neutralizes even after SCALE REMOVER LIQUID addition, drain off and re-start with a fresh solution. Rinse thoroughly the boiler with fresh water and circulate a 1-2% solution of CHEMALK for at least 3 hours or until a neutral pH is obtained.

SOAKING METHOD
This method will produce acceptable cleaning results where recirculation, especially on heat exchangers, cannot be arranged.
Disconnect exchanger from circuit and drain. Use one of inlet/outlet connections or cleaning plugs to provide a steam feeding pipe into the exchanger. Leave uppermost connection/plug open for ventilation.
Fill the exchanger with warm water. Check the acid solution strength.
Allow the product to act and periodically apply steam to maintain temperature. Thoroughly flush with fresh water and as a final step use o solution of 1-2% of CHEMALK to neutralize the remaining acids.