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PHOSPHATE is a highly soluble, powder compound significantly effective for the reduction of hardness and scale control in all types of boilers. The specific purpose is to remove all calcium hard salts by blow down to a non-consistent soft sludge, whilst maintaining a natural level of phosphate concentration in the boiler’s water. This way proper hardness regulation is assured.

Characteristics, Advantages & Applications

  • Highly soluble, unlike ordinary sodium phosphates that experience a low solubility at high temperatures.
  • Maintains a regular phosphate balance, resulting in efficient hardness control.
  • Removes calcium hardness by blow down.
  • Cost effective, easy to apply and use.

Physical Properties

PHOSPHATE is a dry powder product, which contains a selected sodium phosphate derivative especially formulated to provide efficient hardness control.

Appearance / Color White, thin granulated powder
Phosphate content Approximately 95%
pH (10% Aqueous Solution) 8-9
Solubility Appreciable
Order No Size (in kgs) Container
675009 25 Plastic drum

Application and Use

A. Dosing Procedure

Initially, for an average boiler of 10 ton water capacity, a quantity of 350-650 grs must be used.

It is important to note that no more than 100-250 grs of PHOSPHATE per 10 tons water capacity will ever be required on a daily basis, especially when the boiler operates with distilled water make-up.

B. Sampling and Testing

Water samples must be drawn and tested periodically, using the MARICHEM PHOSPHATE TEST KIT (or WT PHOSP TEST KIT). To determine if use of PHOSPHATE is required, please consult evaluation chart and dosing procedure below. Each sample should be taken every 24 hours from the special sampling valve. If this is not possible, the samples should be taken from a point which can provide a representative sample of the entire system. Keep in mind, that this same point must be used for the regular testing, thereafter.

C. Feeding Procedure

Once the quantity of PHOSPHATE necessary to apply has been determined, the engineer must dissolve it in hot water at a ratio of 1/20 (1 part of phosphate to 20 parts of water). Afterwards, feed to the boiler via a by-pass feeder or a chemical pressure feed pump. In the situation where several boilers are involved, separate feed lines must be installed for each one in order to ensure that every boiler receives the right quantity for treatment.

Test Results Evaluation Chart

TEST RESULT 0-10 ppm 10-20 ppm 20-40 ppm Over ppm
QUANTITY OF PHOSPHATE TO BE ADDED 30 g/ton of water 15 g/ton of water Satisfactory Blowdown

NOTE: For sample results less than 20 ppm phosphate concentration, supply the system with the prescribed dosage as in the chart above.

For sample results greater than 40 ppm phosphate concentration, perform blowdown and supply with the initial dosage prescribed below.

Initial Dosage

PHOSPHATE : 350-650 grs/10 tons of fresh water

Safety and Handling

HANDLING Handle with care. Store in a dry, cool and well ventilated environment.
Eye Contact Avoid Eye contact. Otherwise, flush with plenty of water for a few minutes. Seek medical attention.
Skin Contact Avoid Skin contact. Otherwise, wash contaminated area thoroughly with water. Seek medical attention.
Inhalation Avoid inhalation of vapors. Otherwise, seek fresh air source at once. Seek medical attention.
If Swallowed Avoid ingestion. Otherwise, consume a considerable quantity of water. Do not induce vomiting. Seek medical attention.
GENERAL INSTRUCTIONS Avoid spillage, splashing and mishandling. Precautionary measures for body protection are strongly recommended before use.

Read the Material Safety Data Sheet before using this product.

For detailed information on safety and health, please refer to Material Safety Data Sheet and/or Product Label.