Captor_TechSheet - Tessenderlo Kerley

Captor ®
Calcium Thiosulfate Solution
Many treatment plants today are looking to use inherently safer chemicals to reduce hazards to health and the environment.
One of these chemicals is Captor, which has become an attractive alternative to traditional water treatment chemicals used for
dechlorination and ozone quenching.
Captor is now solving a number of traditional problems for water and wastewater treatment plant operators. Tank and line
heating are generally not needed, and the product presents no problem with off-gassing. Captor offers several advantages over
the use of traditional treatment chemicals, including:
• It is a non-hazardous solution
• Maintains a low freezing point
• No potential SO2 exposure
• pH Neutral
• Nearly Odorless
• Water Clear
In addition, the use of Captor places less stress on the environment as compared to other chemicals. Captor is not an oxygen
scavenger and consequently does not reduce dissolved oxygen; its near-neutral pH hardly affects the pH value of the water.
TYPICAL PROPERTIES
Active Ingredient [w/v % Calcium Thiosulfate]................................................30% Minimum
Active Ingredient [w/w % Calcium Thiosulfate] ..............................................24% Minimum
pH [Full Strength] .............................................................................................6.5-8.0
Specific Gravity.................................................................................................1.20-1.32
Weight per US Gallon........................................................................................10-11 lbs/gal
Crystallization Temperature..............................................................................24-28°F (-4.4 to -2.2°C)
PACKAGING AND HANDLING
Captor is manufactured as an aqueous solution according to NSF Standard 60 at several sites here in the US. It is available in nonreturnable
drums or totes, or shipped in bulk tank trucks or cars. Store totes, drums and small containers out of direct sunlight at moderate
temperatures. Materials of construction suitable for storing and handling Captor include stainless steel, aluminum, fiberglass, poly tanks
or lined carbon steel.
Captor is considered non-hazardous with NFPA ratings: 0–0–0 for health, flammability, and reactivity. The vapor space over the solution
is largely water (no off-gassing) and bulk storage is generally permitted without secondary containment. Avoid mixing Captor with acids.
Observe all safety precautions shown on the Material Safety Data Sheet.
(For dosage rates see back page)
The information contained herein is based on data which is believed to be accurate.
However, no warranty of merchantability, fitness for use, or any other warranty is
expressed or is to be implied concerning the accuracy of these data, the results to be
obtained from the use of the material, or the hazards connected with such use. This
information is furnished on the condition that the person receiving it shall make his
own determination as to the suitability of the material for his particular purpose
and on the condition that he assumes the risk for his use thereof.
Tessenderlo Kerley, Inc
2255 N. 44th Street
Suite 300
Phoenix, AZ 85008
Telephone 602.889.8300
Toll Free 800.525.2803
www.tkinet.com

Dosage Rates for Dechlorination
Gallons of Captor Per Million Gallons of Water
Parts per Million Chlorine
pH 1 2 3 4 5 6 7 8 9 10
6.5 5.4 10.9 16.3 21.7 27.1 32.5 37.9 43.4 48.8 54.2
6.8 5.3 10.5 15.8 21.0 26.3 31.5 36.8 42.0 47.1 52.5
7.0 5.1 10.3 15.4 20.6 25.7 30.8 36.0 41.1 46.2 51.4
7.2 5.0 10.0 15.1 20.1 25.1 30.1 35.2 40.2 45.2 50.2
7.4 4.9 9.8 14.7 19.6 24.5 29.4 34.3 39.2 44.2 49.1
7.6 4.8 9.6 14.4 19.2 24.0 28.7 33.5 38.3 43.1 47.9
7.8 4.7 9.3 14.0 18.7 23.4 28.0 32.7 37.4 42.1 46.7
8.0 4.6 9.1 13.7 18.2 22.8 27.3 31.9 36.5 41.0 45.6
8.5 4.3 8.4 12.8 17.1 21.3 25.6 29.9 34.1 38.4 42.7
9.0 4.0 8.0 11.9 15.9 19.9 23.9 27.8 31.8 35.8 39.8
9.5 3.7 7.4 11.1 14.8 18.4 22.1 25.8 29.5 33.2 36.9
10.0 3.4 6.8 10.2 13.6 17.0 20.4 23.8 27.2 30.6 34.0
Dosage Rates for Ozone Quenching
Gallons Per Minute (GPM) of Captor to Use
Treated Water
Ozone Residual – ppm
Flow In GPM 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
100,000 0.03 0.05 0.08 0.11 0.13 0.16 0.19 0.21 0.24 0.26
200,000 0.05 0.11 0.16 0.21 0.26 0.32 0.37 0.42 0.48 0.53
300,000 0.08 0.16 0.24 0.32 0.40 0.48 0.56 0.64 0.71 0.79
500,000 0.13 0.26 0.40 0.53 0.66 0.79 0.93 1.06 1.19 1.32
1,000,000 0.26 0.53 0.79 1.06 1.32 1.59 1.85 2.12 2.38 2.65
These rates are approximate and may be affected by factors such as temperature, reaction time
and dissolved compounds in water which may react with Captor.