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Case Study from ASL Limited Drainage Specialists in Surrey

Case studies from ASL Limited based on live reports of drainage jobs

Case Studies with ASL Limited

The case studies you will read about on these pages are created from live jobs that ASL Limited has attended and reports that ASL Limited has written for those jobs. All names, locations and identifying details have been changed for privacy purposes. We hope that you find the information you would like to learn about and get a feel for the detail of care that we strive to deliver for our customers. If you think you have a similar problem that we can help you with then do get in touch and we will certainly do all we can to help.

From here you can view the latest case studies below and filter them by category.

This is a photo of the fat, grease & oil removed from a treatment plant.
The combination of large amounts of fat, grease and oil and surface water Further to our previous recommendations, we attended a customer’s address on Wednesday, the 1st of December 2021. We broke up and removed thick sewage along with a large amount of fat from the existing holding tank and…
This is a cross section diagram of a Klargester treatment plant by ASL Limited
This case study is based on the proactive action of one of our customers when they were moving house.  You will see from the results of our report that this particular survey presented options for the client to choose from and gave them all the information they would need to negotiate within the…
This is a picture of an old clinker bed discovered by ASL Limited whilst surveying a private sewage system for a house purchase drain survey.
On request, we surveyed the 'septic tank’ our client was told existed. You will see from the results of our report that this particular survey saved our client thousands of pounds in the negotiations of the house purchase because the existing sewage system wasn't fit for purpose. Without the…
When upgrading to a treatment plant, sometimes the old septic tank can still be used in addition.
This case study is based on the proactive action of one of our customers when they were moving house. On request, we estimated the installation of a new treatment plant as a result of the commercial survey before the exchange.  Observations & Findings A “state of the art” domestic sewage…
This is a picture of a treatment plant installation taking place
Re-estimate for drainage works required: main sewer connection or septic tank conversion. This case study sets out the benefits of planning for every eventuality regarding private sewage system handling capacity.   This image shows a 12 population treatment plant being installed.…
This picture shows ASL Limited Engineers carrying out a CCTV drain survey.
When we buy a house, the last thing we tend to think about is whether or not the drains are working properly. This is also not included in a regular house purchase survey that your conveyancer will organise for you. And yet, if the drainage system is not connected to the main sewer, it could be a…
This picture shows a pump with signs of fat and grease in the system.
We hope this case study will help to understand the effects of grease, fat & oil on your private sewage system, drainage field and the environment. This example is of a Klargester Biodisc that has a wheel as part of the mechanism.  Observations & Findings This is an example of the…
Maintenance checks being carried out on a customer's treatment plant
Once we have a treatment plant installed, it is easy to put it out of our minds and expect everything to function perfectly. Well, at ASL, we want that to be the case for all our customers and for that reason, we come back and check on the treatment plants that we install. We do this A to check…
A broken pipe discovered when emptying the septic tank.
A sewage pipe renewal and connection to foul drains. We’ve all done it – grabbed that opportunity for someone to do something on the side. We know it’s taking a risk, but the temptation to save some money is all too damning when the result is less than adequate OR even very damaging. The final…
A photo of Ken with the ASL Limited sewage tanker.
When installing a private sewage treatment plant, discussions about the right solution for you are so important. To trust is imperative. As drainage specialists, our aims are to:  Save time.  Achieve quality.  Be cost-effective. AND  Protect our land, rivers, and streams.   The following…