An 8″ resin column (10.25″ total height) that softens up to 70 gallons of medium hard water (7 gpg hardness) before requiring regeneration or fresh resin. Model S softener is furnished in the Model AT-38 and AT-Q-38 outfits.

Help kids understand the life cycle and habitats of freshwater aquatic macroinvertebrates with this set of flashcards and manual. The 22 full-color cards feature photos of both immature and adult insect stages, and detail life cycle and habitat information. The accompanying manual contains facts on insect characteristics, life cycles, taxonomy, classification, food webs and how macroinvertebrates can be indicators of water quality.

Instructions for activities with the cards are included. The Freshwater Aquatic Macroinvertebrate: Insect Life Cycle and Habitat Flashcards can be used as an extension to the Freshwater Aquatic Macroinvertebrate: Identification Flashcards and the Leaf Pack Experiments Stream Ecology Kit.

This Alkalinity test kit provides total alkalinity readings only, using a Direct Reading Titrator. Testing range/sensitivity 0-200 ppm/4 ppm as CaCO₃.

This kit tests for nitrite using the direct reading titrator method. Range/sensitivity is 0-1000 ppm/20 ppm NaNO₂.

These 6″ x 4″ (15 x 10cm) plastic zipper top bags have instructions for collection and preparation of soil samples printed directly on each bag. By preventing contamination or accidental mixing of different samples, these convenient soil bags help insure accurate test results.

Package of 100.

Provides equipment to monitor nine parameters most critical for the salt water aquaculturist. Reagents, labware, and accessories are mounted in ethafoam for convenient test selection and portability. Short form lid label instructions are always available for quick reference, and a long form booklet provides detailed instructions with kit diagram. Unit is supplied complete with labware, accessories, sampling bottles, and reagents for 50 tests of each factor.

This kit tests for Sulfite using the Direct Reading Titrator method. Range and sensitivity is 0-100 ppm/2 ppm SO₃^2-.

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.