New from Tetra Tech RTW is a screensaver program for your Windows Operating System. The RTW Activated Sludge Microorganism Screensaver features all 36 images from The RTW Chart of Common Activated Sludge Microorganisms in a revolving loop that is not only educational and great fun, but also helps to save your monitor from burn-in. The software is available on CD-ROM for the low price of $9.95 plus shipping and handling.

The RTW Chart of Common Activated Sludge Microorganisms Price: $9.95 Shipping: $5.00

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Alternatively, you can download limited versions of the screensaver for free:
Download the free 15 image broadband screensaver (7.2 MB)
Download the free 6 image dialup screensaver (4.7 MB)

* S&H for contiguous U.S.
Outside the U.S. will be actual cost of carrier.