• ✔ Ready to be shipped
Diesel Bug Dipslides

Diesel Bug Dip Slides Tests (Box of 10)

Diesel / Fuel Bug Testing Dipslides (pack of 10 slides)


By buying this product you can collect up to 11 points


DBBTM2 Volume discounts

Quantity Price You Save
51 £11.33 Up to £32.14
101 £10.89 Up to £107.75
251 £10.26 Up to £427.48
501 £9.70 Up to £1,131.88
1000 £7.94 Up to £4,024.54

Product specification

Front Agar Type Nutrient TTC
Front Agar Colour Straw
Front Agar Growth Total Count (TTC / Red Spot)
Rear Agar Type Malt Extract
Rear Agar Colour Brown
Rear Agar Growth Yeasts & Moulds
Shelf Life 6 to 8 months
Certification ISO 9001
Suggested Incubation Times 24 - 120 Hours
Suggested Incubation Temp 30°C

When water is present in a fuel tank / system, it can cause micro-organisms to grow that will contaminate the fuel. The contaminants create a sludge like waste that can cause damage / corrosion to an engine or other parts. Examples of this are blocked filters or fuel pump failure / blockage. 

Diesel / Fuel Bug can also cause deterioration of the fuel itself and higher rates of fuel consumption.

If left unchecked, a buildup of 'fuel bug' organisms can result in total engine failure. 

If your fuel tank isn't maintained on a regular basis and fuel is left standing for a long time, this can cause already present micro-organisms to multiply. Hot weather conditions will also contribute to worsening any infestation. 

Our dipslides are an easy and effective way to test if your fuel is contaminated.

Flexible paddle

Flexible Paddle

Each dipslide features a virtually unbreakable and flexible paddle allowing for even, full surface testing.

Easy run off design

Easy Run Off Design

Due to the design of the dipslide, fluids will drain off quickly during testing.

Recessed Handle

Recessed Handle

Each slide has a handle built into the lid that is recessed to help keep your fingers dry during testing.

Side Indicator

Side Indicator

One side of the slide will have a circle indicator so you know which side was used for testing which type of contaminant.

Dual sided paddle

Dual Sided

Each dipslide is dual sided to allow multiple contamination testing with one test.

Thick reliable Agar

Thick Reliable Agar

Each agar is thick (approx 4mm) and raised above the dipslide to allow for easy surface testing.

Fuel / Diesel Bug Dipslide Applications:

  • Marine diesel fuel systems
  • Rail diesel engines
  • Aviation / jet fuel
  • Agricultural equipment (tractors etc)
  • Motorhomes
  • Haulage
  • Fuel distribution systems

Our DBBTM2 dipslides are perfect for testing diesel / fuel applications. This product listing price is for 1 box of 10 slides.
These dipslides test for total bacteria count on one side and yeasts and moulds on the other.

These slides feature red spot dye which means that the colonies will show as red dots. 

How to test diesel / fuel using DBBTM2 dipslides

  1. Carefully collect a sample of fuel. You may want to wear gloves whilst testing your fuel.
  2. Dip the slide in the fuel for approx 10 seconds. Completely immerse both sides.
  3. Allow excess fuel to drain from the slide.
  4. Return the slide to its container and replace the cap.
  5. Incubate the slide for 24 - 48 hours.
  6. Analyse your results using the enclosed comparison chart.

In order to properly incubate your dipslides, you will need to use a dipslide incubator. You can view our range here.

Remove Diesel Bug slide from tube

Step 1 : Remove slide

Carefully remove the sterile Diesel Bug dip slide from its tube ensuring that no contact is made with the agar (to avoid contamination).

Surface testing

Step 2 : If Surface Testing

For surface testing, press the Diesel Bug dipslide onto the surface. If needed, place a finger on the bottom of the slide (on the plastic, not the agar) to apply extra pressure.

Liquid Testing

Step 2 : If liquid testing

For liquid testing, immerse the Diesel Bug dipslide into the fluid for 10 seconds then remove and allow to drain for a few seconds.

Swab Testing

Step 2 : If swab testing

Apply a sample of the test substance to a sterile swab and gently apply to the agars.

Incubate the dipslide

Step 3 : Incubate Slide

Label the tube with the included stickers then place the slide into an incubator and allow to incubate.

compare dipslide results

Step 4 : Compare results

Count the amount of colonies that have grown on the slide and compare them to the comparison chart provided.

Reading the results

Nutrient Side

Level of infection in liquids







Approx colonies per agar







Example Image

102.jpg 103.jpg 104.jpg 105.jpg 106.jpg 107.jpg

Level of infection on surfaces

0.4 2.5 12 40 100 250

Malt Extract Side

Level of yeasts in liquids







Approx yeasts colonies per agar







Example Image

Yeast dipslide growth Yeast dipslide growth Yeast dipslide growth Yeast dipslide growth Yeast dipslide growth Yeast dipslide growth

Level of yeasts on surfaces







Malt Extract Side

Level of moulds




Example Image

Light mould growth on slide Medium mould growth on slide heavy mould growth on slide

Testing fuel for Sulphate Reducing Bacteria

Sulphate reducing bacteria can corrode metal at a very rapid pace if the fuel contamination is particularly bad. This can cause major problems especially with oil pipelines. We sell SRB dipslides in boxes of 10. Please see our SRB slides here.

Customer Questions


Is shipping made through DHL?


Hello, Shipping depends on your delivery address. We use either UPS, DHL, APC or Royal Mail depending on the location.


Specific References


Malt Extract Comparison Chart

Malt Extract comparison chart in JPG format

Download (1.77M)


MSDS Sheet for Dipslides

Download (278.29k)

Nutrient Comparison Chart

Nutrient comparison chart in JPG format

Download (1.62M)

Diesel Bug Datasheet

Diesel Bug Dipslide Datasheet (PDF)

Download (1.75M)