Tips and Tricks

Independent Comparison Study from USGS

usgs study 1 2016Here's an independently published study where the HydraSleeve was compared to using purge and pump sampling. 

Concentration Comparison of Selected Constituents between Groundwater Samples Collected within the Missouri River Alluvial Aquifer using Purge and Pump and Grab-Sampling Methods, near the City of Independence, Missouri, 2013

This study includes agricultural nutrients sampled with the HydraSleeve as well as numerous other parameters.  The takeaway is that HydraSleeves can work to replace the current sampling method (volume purging) except for sample volume needed for duplicates samples.  The wells are all 2-inch diameter with 5-foot screen intervals, limiting sample volume available for no-purge sampling.  The laboratory required 2-liters of sample for duplicate analysis. The investigators are planning to either reduce the number of parameters analyzed or reduce the analytical volume requirements for duplicate samples during the next phase of the study.

Please click the image to download the full report.

Converting to the New Heavy Duty Universal SuperSleeves

Last month we made the announcement about having Heavy Duty SuperSleeves available as an optional purchase.

Please see the details at this link: 2L

In order to enhance product integrity we have decided to switch all SuperSleeves and SkinnySleeves over to the new heavy duty material. 

We are updating all of our inventory and are ready to fill orders at this time. 

The sizes are all in the SkinnySleeve sizes which are slightly longer and smaller diameter than the SuperSleeves.  However when sized with the correct Top Weights they will still fill within the same zone because they will compress farther into the bottom of the well (20 inches instead of 24 for the 2-liter variety).  You will get slightly less sample volume; however it will still be approximately 1-liter; 1.5-liters; and 2-liters when using the new products.

So, now that they are universal the difference is not in the sleeve - it's in the hardware.  The smaller diameter bag will now stretch to fit over the larger SuperSleeve hardware because there are no seams to tear and it's more durable.  So if you are using the the new Heavy Duty Universal SuperSleeve in Schedule 40 wells you will purchase SuperSleeve weights or collars; if you are using them in Schedule 80 (or 50mm) wells you need to purchase SkinnySleeve hardware.

2-inch Heavy Duty Universal SuperSleeves - For use in all 2-inch PVC wells will fit Sched 40 and Sched 80 and 50mm wells
   1-liter length 31 inches cost $21
1.5-liter length 46 inches cost $24
   2-liter length 60 inches cost $26
2-inch SuperSleeve Reusable Components for Schedule 40 wells
PVC COLLAR - for bottom weighted deployment $29
8-ounce bottom weight to be used with collar cost $23
PVC/Stainless top weight for short screens & short water columns cost $68
5-ounce bottom weight to be used with top weight cost $13
2-inch SkinnySleeve Reusable Components for 50mm or Schedule 80 wells
PVC COLLAR - for bottom weighted deployment cost $29
8-ounce bottom weight to be used with collar cost $23
PVC/Stainless top weight for short screens & short water columns cost $68
5-ounce bottom weight to be used with top weight cost $13
Please click here for assembly instructions.

New Heavy Duty, Universal 2-liter Super/SkinnySleeves

Our standard HydraSleeves and SpeedBags are produced at a facility and on the same line that fabricates medical IV bags, liquid specimen bags, blood bags and flexible food packaging.  All of these items, as well as our products, must be flexible and have a high integrity water-tight seal.  But, the maximum working length for products produced on this equipment is 38 inches.  For our products made on this equipment the restriction on the length, combined with the limited internal diameter of a 2-inch well results in a maximum sample volume of about 1.25 liters for 2-inch wells.

For our larger volume samplers used in 2-inch wells (the longer SuperSleeves and SkinnySleeves) we must go to a different manufacturing process which results in a lower integrity seal on the sides of the sleeve.  Most of the time these longer sleeves function fine, but occasionally, again due to the production process, some units have had pinhole leaks and may even burst along the side seam when full.  (Note:  Once they leave the water table the internal pressure at the bottom of the long sleeves is substantial and will usually be the location  where the side seams will fail.)  Although SuperSleeves have been used since 2009 with very few failures, we still would like to address the issue and improve or product line.

Unfortunately we cannot see the presence of pinholes or determine the integrity of the side seams on these units during the inspection and assembly process.  We do conduct regular spot pressure tests of the sleeves at regular intervals, but the leaks are not consistent from run to run and will intermittently appear in the same run.

So, as an option, to assure you don't lose your sample when using the longer Super/SkinnySleeves we have found a production facility that makes the same material but it is extruded so there is no seam.  This means that the possibility for pinholes and tearing along the seam has been drastiaclly reduced.   Also pressure tests show that when compared to the old material the new extruded material takes about double the pressure to burst.  The manufactured SpeedBag bursts at 10 psi; the old SuperSleeve material bursts at 8 psi; and the new extruded SuperSleeve material bursts at 20 psi (the equivalent of 46 feet of water).  It should be noted that the extruded material did not burst or blow out, it separated from the connection to the pressure hose.

We have made these new heavy duty sleeves universal, in that they will fit both Schedule 40 and Schedule 80 as well as metric 50 mm wells.  The difference will be which top weight or collar you choose.  The dimensions are actually the same dimensions as our standard SkinnySleeves, but the material is flexible enough that it will also work with the schedule 40 hardware.   As you can see in this photo the material is more opaque than the standard SuperSleeve material but that is hard to determine when they are folded and inside the normal packaging.  So until we get permanent packaging, to differentiate between the assembled sleeves, these will come sealed in a generic green Ziploc bag as pictured here. 


We also think it's nice to have the blue check valve just for visibility.

The dimensions are 1.75 O.D. x 66 inches long and they hold ~2 liters of sample.  Using the SuperSleeve top weight they compress to within 20 inches from the bottom of the well in 24 hours; with the SkinnySleeve top weight they compress to within 24 inches from the bottom of the well.  Since the Heavy Duty SuperSleeve compresses farther than the standard units, even though, these are 6 inches longer they still fill in 7 feet of saturated screen.

These new heavy duty bags are only available in the 2-liter size.  They are $27.00 ($5 more than the standard units) and are optional for now.   Order now.

The standard 2-liter Super/SkinnySleeves will be available while supplies last.

We encourage you to make the switch to these new heavy duty 2-liter bags.  We have much more confidence in this material for the longer sleeves. 

Please note that the shorter 1-liter and 1.5-liter bags do not normally experience the pinholes and leaking because there is not enough pressure in the bag to make them fail.  If you would like the heavy duty version in the smaller sizes, they can always be shortened as with any HydraSleeve.  See instructions here.




More Comparisons - No-Flow to Low-Flow

It seems that the introduction of SkinnySleeves, those are the HydraSleeves designed specifically to fit 50 mm wells, has led to increased HydraSleeve use in Australia.

The following links were found by searching the internet for HydraSleeve news.  Just like all of the other independent studies you see on our website; these are truly independent studies.  We had no input whatsoever, administratively or economically that would influence any of the results you see in these links.

We are excited to share these 2 additional reports for HydraSleeve and No-Purge Groundwater Sampling studies.

The first item is a summary paper where they used HydraSleeves to compare no-purge, passive sampling to low flow sampling techniques.   erm-aus-study.pdf

This second study can be found here:  AUS-2015HydraSleeveTrials.pdf

aus 2015hstrialpic


 It covers the same type of study, "No-flow versus Low-flow", but there are more details, complete with comparison data and scatter plot charts showing the actual lab results from the two.