Here we make the SmartBlock line of block digesters. They include a 100 position COD block digester and a 56 position trace metals digester. We also manufacture premium quality COD tubes in the 5-150ppm, 20-1500ppm and 20-900ppm for NPDES compliance monitoring. Mercury free versions are available. Our price is unbeatable, especially in this uncertain economy. We also OEM COD tubes to lab supply companies. Inquire with us soon!

About Us

We are a Manufacturer of COD Tubes, BOD Standards, and Smartblocks for trace metals digestions. With over 20 years experience our company is providing low cost alternatives to your current vendors!!!

Our Company History

Columbia Analytical Instruments began in 1995 as a division of Columbia Analytical Laboratories. In 2003, our President sold his controlling interest in Columbia Analytical Laboratories to devote his efforts to increasing production of his manufacturing by CAI, Inc.

Thanks to some wonderful support from across the country, sales have increased each year since the beginning.  The reason our sales continue to grow each year is due to our ability to provide great products for economic pricing.

New production techniques and equipment are added as necessary to keep up with the rapid response times we are known for. In 2010, we introduced new 'greener' and smaller packaging which results in less impact on our environment and less room for storage.

We are in the process of designing automated equipment to further reduce the cost of our products and to increase quality control.  We expect to have these in place and operating by the end of August, 2011.

Our Business Philosophy

Quality is important to any business. We emphasize quality throughout each step of our process. We also strive to be as efficient as possible so we can offer a competitive price to our customers.

With over 20 years of environmental laboratory experience, we know what you are looking for.

First-class quality and service have established themselves as our core business philosphy.


SmartBlock - Model 226 - PID Temperature Controller

The 100-position SmartBlock 226 is unique to CAI. This product was produced for Columbia Analytical Laboratories in 1995 to enhance our productivity digesting COD samples. With this instrument, 100 samples can be digested in 2 hours, 8 hours faster than with a 25 position device. The PID temperature controller includes a timer for unattended after-hours operation. We have also created a 50- and 25-place digester which can be upgrade to the larger ...

GGA Standards for APHA BOD5

We produce these using DI water, then adding glucose and glutamic acid.  Once the solution is placed within the vial, the material is sterilized at 121C for 15minutes. Once cooled, the resulting product is tested for TOC and COD and the theoretical BOD5 calculated. In addition, heterotrophic plate count is done to ensure sterility and stable shelf life. The vials are then packaged in 50 or 150 count boxes and ready for distribution.


Company details

Business Type:

Industry Type:
Water and Wastewater

Market Focus:
Internationally (various countries)

Year Founded:


less than $1,000,000 US

Office Locations:


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