The new LaMotte twin-chambered softener clearly demonstrates the advantages of advanced two-part treatment systems. Customize one today to demonstrate the true effectiveness of your treatment system. Also available: Order Code 1022 DuoSoft unit empty to fill with your choice of media.

• Treat tap water in one pass with a two chambered softener
• Filter screen divider prevents bleeding of media between beds
• Two 4½ columns (10.25½ total height)
• A filled Duo-Soft is furnished in the Model AT-40 and AT-Q-40 outfit

Use this set of 18 full color flash cards alone or as an addition to any macroinvertebrate activity. (Included in the Leaf Pack Experiments Stream Ecology Kit). The front of each card features a full-color photograph of a common macroinvertebrate in its natural environment. A list of dichotomous characteristics, a measuring scale, and detailed drawings on the back of each card aid in the identification process.

Helpful notes prevent confusion between macroinvertebrates with a similar appearance. A hole can be punched in the wide border of the laminated cards so they can be organized on a ring for field or classroom use.

This Alkalinity Test Kit use titrations with standard acid to the phenolphthalein (P) and/or total (T) alkalinity endpoint. Range and sensitivity is 0-200 ppm/ 4 ppm as CaCO₃.

This kit tests for Total Hardness (Low Range) by using the Direct Reading Titrator Method. All results are as CaCO₃. Range/sensitivity is 0-10 ppm/0.2 ppm CaCO₃.

This kit tests for nitrite using the dropper pipet method. Range/sensitivity is 1 drop = 50 or 100 ppm NaNO₂.

Safe, easy, and economical! Students can perform up to fifty tests each for nitrogen, phosphorus, and potassium levels using non-hazardous TesTabs^®. Each kit includes the necessary apparatus, simple diagrammed instructions, and a laminated color chart.

The NPK Soil Test Kit was specifically designed to meet the needs of the GLOBE Program™ (Global Learning and Observations to Benefit the Environment). This soil test kit is fun to use and easy to ship anywhere! Ideal for upper elementary, middle, and high school students.

This kit tests for Phosphate using the Octa-Slide 2 Comparator. Range and sensitivity is 0.5, 1, 2, 3, 4, 6, 8, 10 ppm and 5, 10, 20, 30, 40, 60, 80, 100 ppm PO₄^3-.

This kit tests for Sulfite using the drop count method. Range and sensitivity is 1 drop = 5 ppm SO₃^2-.

The Model AR-42 has the same test range for pH, Hardness, and Iron as the AR-02, but it also is equipped to test for Sulfide (0.2-20 ppm). Includes 50 tests for pH, Hardness, and Sulfide; 100 tests for Iron.

A creepy, crawly, wet investigation of the health of streams, ponds, and other freshwater environments. Following the easy-to-read BUGKIT manual, one to two students learn to collect, observe, sort, and identify aquatic insects as a tool for measuring water quality.

Students can complete the activity at home after collection or spend an afternoon outdoors beside a stream. The BUGKIT includes mesh leaf bags for collection, trays and plastic dishes for sorting, a magnifying lens, BUG GUIDE, and a BUG BOARD identification chart. Ideal for bug-hunters, age 8 and up.