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54 C&EN

Take α close look at this section of boiler tube from our Groton plant. "Since replacing coordinated phosphate treatment with an EDTA water treating program, we've cut our boiler water treating costs by 44%." J. R. Rowland, Utilities Manager, Chas. Pfizer & Co., Groton, Conn.

Now Pfizer offers y ou calculated control of feed-water hardness.

Read how Pfizer's full line of chelating agents and a unique chelant selection method can help you solve your water contaminants problems more efficiently.

CHELATINCAeEMT

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What is Calculated Control? 1. The broadest line of chelating agents available:

Citrates, Gluconates, Tartrates, Oxalates, EDTA, HEDTA, DTPA, DEG, and NTA. m

m 2. Chelating agent calculators. At a glance

you can determine which chelating agent to use and how much is needed to sequester a given metallic ion at a given pH range.

3. Your Pfizer representative supported by the most advanced Technical Service available, and backed by over 40 years of chelating agent manufacturing know-how.

Take a good look at your own plant and equipment. See if sludge and scale deposi­tion has (or is about to) cause expensive fail­ures and down-time. See if feed-water hard­ness is causing costly production problems, or frequent equipment cleaning. Then let your Pfizer representa­tive show you how Pfizer's calculated control can help you prevent these problems. For example: when feed-water hardness is less than 5 ppm, EDTA or one of the other Pfizer chelating agents may provide you with the most efficient and safest results. We cut our costs 44%

by changing to an EDTA system; perhaps you can save even more.

Get control of your water treating problems. And take advantage of Pfizer's free offer: two calculators designed to simplify your choice of chelating agents. Call your Pfizer representative and mail this coupon today.

To simplify my selection of chelating agents, please send me: D The Pfizer usage calculator which tells me

at a glance the right chelating agent to use. G The Pfizer guantity calculator which tells me

guickly the correct amount of chelating agent to use.

D Both.

Name-

Firm—

Street—

City

Position-

Pfi**t CHEMICAL DIVISION

Chas. Pfizer & Co., Inc., Chemical Division, 235 East 42nd Street, New York, N.Y. 10017 CN

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C&EN 55