Tips and Tricks

Extra Heavy 4-inch Top Weight

Quite often we have requests to make extra-large 4-inch custom HydraSleeves.  We have found that adding some diameter and length to our HS-4-2L check valve set up we can make a custom sleeve that can hold 1.3 liters per foot.  So if we make one that is 5-feet long, it holds 6.5 liters.  When full, it makes a 3-inch OD HydraSleeve, and it can hold quite a bit more in one HydrSleeve than any of our standard units. 

Granted, these are quite heavy.  They weigh 15 pounds when full, but sometimes a set up like this is the best solution.

At the time we didn't have a top weight that would compress this unit close the bottom of the well.  So, Kent went to work and designed a stainless ring to fit over the top of our standard 4-inch top weight.  Together these units will compress a custom extra-large 4-inch HydraSleeve to within 20 inches of the bottom.  So the sample collection process would begin at 20 inches and continue for 5 feet above that location, basically allowing for a 6.5 liter sample to be collected from a 7 foot saturated screen in a 4-inch Shedule 40 well.  If you have schedule 80 you will need a longer screen because it won't compress as far.

Basically we have added a stainless steel ring:  IMG 6987                                                    To the standard 4-inch top weight:  IMG 6986

 IMG 6983







The ring rests on the ledge that protrudes from the 4-inch top weight and it is held in place with gravity and the spring clip also keeps it from coming off once assembled.

Together they weigh approximately 44 ounces.  The ring adds an additional 20 ounces to the already 24 ounce top weight.

Components will be ordered separately as follows:


Custom 4-inch HydraSleeve $55.00 - must call to order, custom units not available online.

Standard 4-inch Top Weight  with spring clip $65.00

4-inch Heavy Ring $45.00 - call to order, prototype quantities only available at the moment.  They will be added to the website when production quantities are available.

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

ITRC Success Stories

The ITRC (Interstate Technology & Regulatory Council) has been instrumental for years in researching and discussing passive, no-purge sampling technology among other things.  hydrasleeve-decant

In a recent announcement they mentioned several success stories -  a couple of them were for converting sites to passive, no-purge smampling.  In both of these links we couldn't help but notice the sites both showed pictures of HydraSleeves as their no-purge samplers.

This first link shows details on the ITRC helping the Air Force cut costs with passive sampling.

The second link explains HydraSleeve and other no-purge samplers being used at the Savannah River Site.



HydraSleeve Advantages

Why choose the HydraSleeve over other no-purge/passive sampling options?                                    


  • Samples all contaminants.

  • Very Simple to use, minimal training...repeatable sampling events.

  • Most cost effective of the no-purge devices.  Average, first time, reusable cost per well ~$40-$50...Average expendable costs ~$20-$25 per well. Average time to sample a 50' well ~17minutes.

  • Not an all or nothing proposition.  Little or no well modification needed.  Don't have to sample all the wells all the time.

  • Minimal displacement and stress on the well.  In some cases eliminates need for equilibration period.



  • Provides greatest sample volume of all no-purge/passive samplers.

  • Maximum sample volume per dollar of all no-purge/passive devices.

  • Will function under adverse ground water chemistry conditions.

  • Can remain in the well years between sample events.





Safe & Happy Summer

Our summertime newsletters are usually short and sweet and this is no exception.

Please have a safe and happy summer as you enjoy your vacations and time spent with family and friends.

We are here for your questions and look forward to working with you now and in the future.

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



US Dept of Energy on Passive Sampling

We are pleased to share with you our latest news coming from independent sources.  The US Department of Energy has issued a short article on Passive Sampling use and specifically HydraSleeves.  

EM’s Use of Cost-Effective Passive Groundwater Sampling Grows

Please click the link for the entire story.  Here's a quote from the article that summarizes the HydraSleeve news in a paragraph.

"A passive sampling strategy involving a device known as Hydrasleeve is employed at about 230 wells at the Savannah River Site (SRS) and is expected to save EM more than $2.5 million over the life of the site’s groundwater monitoring program. Preferred for use with wells with small sample volume requirements, the Hydrasleeve, a flexible plastic bag permeable to water and contaminants, allows remediation engineers to monitor for contaminants such as trichloroethylene and tritium left by Cold War operations without purging, a time-consuming practice of removing water that often must be disposed as hazardous or radioactive waste."

Naturally, we are always happy to post another independent study when they come along.  Please take a look at this short, 1-page summary on how passive sampling is saving millions for this groundwter monitoring program.