Technical Information


Tips and Tricks

What's in your well?

Introducing a simple way to find out - the NEW Cordry Core Sampler. clampedcore

Collecting a continuous, sequential core sample from a long well screen in a 2-inch well is typically a difficult and potentially expensive task. Previously, long HydraSleeves and SuperSleeves that could carry out this job were heavy and unwieldly, and our recommendation was that retrieval should be accomplished with at least two people. Alternatively, discrete interval samples from long well screens could be taken by deploying multiple samples at the various intervals. To provide a simpler and less expensive option, GeoInsight has developed the Cordry Core Sampler.

The Cordry Core Sampler will collect a continuous, sequential core sample to vertically profile a water column. It is a thin sleeve that allows it to be easily deployed and retrieved with minimal strain or effort. Once retrieved, the sample in the sleeve will mirror the column of water in the well. Concentrations from different intervals are not mixed and can be isolated using special clamps applied to the outside of the sleeve.

















Please click the link below for the white paper that describes this new product in detail.


The Cordry Core will be custom made per application, based on the well specs (2-inch diameter wells only) and customer needs. 

Please give us a call 800-996-2225 or email This email address is being protected from spambots. You need JavaScript enabled to view it. for more information.




HydraSleeves were invented in the United States and have always been made in America, using American materials and American labor. 


You can rest assured the products you purchase from GeoInsight will always be of top quality. 


If there is ever an issue with our poducts, please let us know.  Customer service from GeoInsight is also from American people with American pride.  We stand behind our products 100% and will do everything in our power to correct any defects or quality issues.  Our refund and warranty policy can be found here.



Have you ever wondered if HydraSleeves can be used in geothermal environments?  It's been asked of us numerous times; andheat pic vg yes, they have actually worked for some geothermal applications in South American of which we are aware.

We recently wanted to see exactly what the limitations are for HydraSleeves in heated environments.  We know the specifications for our proprietary virgin food/medical grade LDPE material are stated to have a high end temperature range of 90 degrees Celcius with a melting point of 150 degrees C.  This translates to 194 degrees Fahrenheit and melting at 302 degrees F.  Basically our experiments found this to be true when heated without pressure.  However, when dealing with extremely deep wells where heat can play a factor, there can also be a lot of pressure.  So, does pressure along with heat change the specs of HydraSleeve use? 

Let us see:

We tested samples of our material in boiling water and in a temperature controlled oven.  To add a pressure component we used an embossing dye squeezed between the jaws of vice grips.  According to the vice grips manufacturer they exert a pressure of 500-2,000 psi.  It's likely that our pressure was on the high end of the scale since it took both hands to close the jaws.  
  1. We boiled the sleeve in water for 10 minutes and immediately removed it and put in in the vice.  Although the embosser left its imprint (it does so at room temperature) there was no indication of the sleeve melting or becoming welded together.
  2. Next we heated the sleeve in a controlled temperature oven to ~230 degrees for 10 minutes and applied pressure.  We had the same results as step one.
  3. Then we heated the sleeve in the oven to 300 F for 10 minutes.  Here we experienced  much different results.  The LDPE began to curl and actually welded itself together without any outside pressure.  The embosser/vice grip sealed the two sides of the bag together.
  4. Finally we reduced the oven temperature to ~260 F and heated the LDPE material.  There was some bag deformation and welding but to a lesser degree than 300 F.  When pressed between the embossing plates the two sides of the sleeve solidly welded together at the pressure point.


HydraSleeves can be used in geothermal applications not exceeding ~230 degrees Fahrenheit.  They should even withstand a good amount of external pressure even at this temperature.  If dissolved gasses (steam) are anticipated the sleeve needs to be vented at the top to allow the expanding gas to escape during recovery.

 heat pic results

 Please call 800-996-2225 or email This email address is being protected from spambots. You need JavaScript enabled to view it. if you have any questions.


The HydraSleeve motto is “Simple by Design”. You will see it all over our packaging and in our literature.

The HydraSleeve was invented to make groundwater sampling a simple job.

The first step in the process of simplifying your groundwater sampling program is making sure you get the correct HydraSleeves and accessories for your job.

Each job or sampling location is different; each well within those locations can be different.

Reviewing the well specs and assigning HydraSleeves to those wells might seem like a daunting task to some. It might look impossible to others. For us, it’s simple. No one knows our products better.

Let us do the work for you….let us make it simple. There are several different ways we can do this for you.

  1. We always review incoming orders to make sure they make sense. If something doesn’t look like it will work together we always bring it to your attention. That being said; you know your wells best – if you think it will work after we have discussed the situation – we will ship what you order.
  2. You can submit smaller jobs and general well information using our well template form – click here. After review and discussion of your job we will offer a quote for the wells listed on the form. The form is limited to 10 wells. Please see suggestion #3 for larger sites.
  3. This email address is being protected from spambots. You need JavaScript enabled to view it.. We will add our suggestion and notes to your documentation. From this, we can work up a quote for any size groundwater sampling program – large or small.

Here’s an example of the information needed as seen in our well template form:



We look forward to hearing from you. It’s our job to make your job…Simple, by Design!

In-Situ UK HydraSleeve Sampling


Our distributor in the United Kingdom (In-Situ Europe) recently posted an article about their experience demonstrating HydraSleeves for their client.  The object of this demo was to determine the answer to these 3 questions:

       1. Could a single HydraSleeve sample provide a comparable dissolved methane concentration?

       2.  Could a single HydraSleeve sample provide sufficient volume of water for laboratory analytical purposes?

       3.  Would water quality concentrations be similar to the ranges established in previous sampling surveys (3 had been carried out to date)?


Here's a link to the article which explains the steps taken in addition to the answers to these questions.

They summed it up quite nicely:

      This was a fascinating practical problem which has simplified the sampling methodology for the client whilst maintaining approved protocols. And the results look good!


In-Situ Europe carries a good selection of HydraSleeves in stock for European HydraSleeve users. Contact by This email address is being protected from spambots. You need JavaScript enabled to view it. or phone: +44 (0)121 733 7743