What price purity? How much is a good laboratory still worth? (A still with an all glass and Teflon® system that produces distilled water of 2 million ohms purity and less than 0.3 ppm total solids from tap water and a 110 volt outlet.) That's our definition of a good water still and we have one in our WS-2 Continuous Water Still—for a surprisingly low $375. A redistillation kit can be added t o satisfy the real purists (actually, the WS-2 makes better distilled water in a single pass than most other stills do with redistillation). There are several ways we assure purity. For example: in the "cyclone separator" the long circular travel path together with two vapor direction changes scrub vapors and
provide good refluxing and de-entrainment. Double venting removes volatile material and dissolved gases. Non-volatile contaminants are carried away in the cooling water drainage. Automatic pressure regulation prevents uneven operation and reduces distillate waste. Depending on local water supplies, the WS-2 with redistiller can consistently achieve resistivity well in excess of 2 million ohms. Besides high purity at low cost, the WS-2 gives you the reliability, durability, and advanced design of Kontes products: nonleaking joints, a rapid-start heater, a n d Teflon tubing and O-rings. If external water pressure drops too low, the still automati-
cally shuts off and triggers both audible and visual alarms. It's compact, portable, and easily cleaned without disassembly. Normal output of distillate is 2 liters an hour. If you've been looking for a low-cost, practical solution to the pure water problem, you couldn't find a better one than the WS-2. Contact your Kontes representative or write for more details. ® Trademark of Du Pont
_
KONTESf^} V i n e l a n d , N e w J e r s e y lat^—nn^
Regional Distributors: KONTES OF ILLINOIS, Franklin Park, Illinois · KONTES OF CALIFORNIA, Berkeley, California Circle No. 147 on Readers' Service Card
