Hydrosense One Ultra Rapid Legionella Water Test (1 test) – 100CFU

£69.99 Inc VAT (£58.33 Ex VAT)

Designed for Legionella detection – results in 35 minutes:

  • Detects Legionella pneumophila serogroup 1
  • Highly sensitive and can detect Legionella levels of 100 cfu
  • Suitable to test a water sample

Bulk Order Discount (Unit Price)

Quantity Price
1 £69.99
2 - 4 £64.99
5 - 9 £62.99
10+ £59.99


Reliable and rapid self testing for Legionella from Hydrosense.

Legionella is a bacteria, which can cause a pneumonia-like disease called “Legionnaires’ Disease”. Legionnaires’ Disease is fatal in approximately 20% of people infected. Infection occurs when the bacteria is inhaled from aerosols of contaminated water. Aerosols can be produced anywhere water is splashed or sprayed, but some of the most common sources associated with Legionnaires’ Disease are cooling towers and showers.

Breakthrough technology from Hydrosense for the rapid detection of legionella – Get accurate on-site results in approx. 35 minutes

This innovative test kit allows the easy and quick testing of water; on-site and without training or experience.

  • Highly sensitive test, water can be collected from any source
  • Highly accurate and recommended for high-risk areas such as cooling towers, water tanks, fountains, showers, sinks, spas and pools.
  • Fast & on-site
  • Kit includes everything required to carry out the test
  • Reliable & independent
  • Audit trail: log & report the results using the Hydrosense App
  • No training or expertise required

How does the test work?

The Hydrosense test detects Legionella antigen using the well-established lateral flow test technology to detect LpSG1 antigen. It works by attaching colour indicators to Legionella antibodies printed on a cellulose strip.

  • Sensitivity: 100 CFU/L
  • Ultra part number: 100198

What is a Lateral flow test: (LFT) technology has been in medicine for more than 30 years and is a standard type of test for hundreds of different uses: medical, environmental, food, beverage, veterinary and drug detection, amongst others.

Does it test for all Legionella bacteria? The test detects Legionella pneumophila serogroup 1 (LpSG1), which is the species that causes over 90% of Legionnaires’ disease cases. With filtration step, the sensitivity of the water test is 100 CFU/L. The test detects Viable-But-Non-Culturable Bacteria and Legionella SG1 in all stages of its life-cycle.

Hydrosense App – Download the free reader app to store the results to provide an audit trail:

  • Log and report your results with the Smartphone Reader, and get independent verification with the Hydrosense portal.
  • The App makes it easier to read the test accurately. It provides a user with a semi-quantified result by returning a score of “0” for no Legionella detected, or a Hazard Index of “1-10” depending on the concentration of the Legionella found.
  • Data collected by the App is automatically synchronised with the Portal. This real-time integration ensures that a track record is kept of all results and helps to identify future trends.

Please contact us for bulk orders and if you would like to set up regular testing. We can provide you with a customised quote.

Suitable for: water collected from any source, industrial as well as domestic hot and cold water systems, including tap, shower, cooling tower, hot tub & pool, humidifier etc. Also suitable to test salt/sea water as long as the water contains normal amounts of salt.
Manual filtration enhances sensitivity.

Bacteria detected: Legionella pneumophila serogroup 1
Sample Volume: 250 ml
Sensitivity: 100 cfu/l
Contains: 1 Test
Total test time: approx. 35 minutes (about 10 minutes for filtering and 25 minute for the results to develop)

User instructions in English, French, Spanish, Italian & German.

Shelf Life: approx. 12-18 months from date of manufacture

MSDS only required for buffer solution. Please contact us to find out more.

Specificity:  Tested against a wide range of waterborne bacteria, including Acinetobacter calcoaceticus, Aeromonas hydrophila subsp. hydrophila, Bacillus subtilis, Burkholderia cepacia, Citrobacter freudii, Citrobacter koseri, Escherichia coli, Enterobacter cloacae, Klebsiella oxytoca, Pseudomonas aeruginosa, Pseudomonas fluorescens, Pseudomonas putida, Pseudomonas stutzeri, Ralstonia pickettii, Raoultella terrigena, Streptococcus pyrogenes, Yersinia ruckeri.
No cross reactions have been observed at concentrations ≤ 109 CFU/L. Staphylococcus aureus has been observed to cross-react with the test at concentrations > 108 CFU/L, which is higher than found in most water samples.

  • Organism / ≥cfu/mL: L.p Sg-2,3,8,11,13,14 / 1.00E+08; L.p. Sg-4,5,6,7,9,10,15 / 1.00E+07; L.p. Sg-12 / 8.00E+06; S.aureus / 2.00E+08

The Hydrosense legionella pneumophila Sg-1 test has been shown to produce weak positive results with other legionella pneumophila serogroups at the cfu/ml stated in the above list.

Biocides: The product has been tested with a range of common biocides and biodispersants used in Legionella control, at their normal maximum operating concentration. Active ingredients tested include: glutaraldehyde, dodecyl-dimethyl-ammonium chloride, isolthazoles, dibromonitrilopropionamide, ionic and non-ionic surfactants.
The Test gives a false positive if used with polymeric biguanide or THPS. It should not be used to test such systems.

To see the full range of Hydrosense Legionella tests: click here.


Please contact us with your requirements for a detailed quote.

Please note: that this is a screening test and can not be used to certify water as safe or unsafe for drinking. This test provides approximate results ONLY when used in strict accordance with instructions. SimplexHealth expressly disclaims any liability resulting from the use of this product, failure to follow instructions, or reliance of test results. This is not a measuring instrument. Wash hands before and after use. Store in a cool, dry place at room temperature 18-22°C and away from excess heat and direct sunlight. Do not freeze. Keep away from children and pets. Avoid contact of test areas on strips with skin & eyes, do not ingest or expose to acids. Dispose of used tests responsibly. Not intended to diagnose, treat or monitor any medical condition.

MPN: HydroSingle 100198

Additional information

Weight 80 g



Hydrosense Pro Legionella Test Kit Hydrosense Legionella Tests are very fast for detecting Legionella. They use Lateral Flow Immunochromatographic Assay (LFICA) technology, exactly the same used in COVID and pregnancy tests - giving quick, accurate and reliable results. The Hydrosense Legionella Tests are an easy-to-use, on-site test solution for water and biofilms, that detect Legionella pneumophila sg1 antigen (see One Ultra Range) or sg1-15 (see Pro Ultra Range). All it takes is approx. 10 minutes to conduct the test process and 25 minutes wait for the results.

Hydrosense Legionella

Hydrosense Legionella Water Test Kits offer very sensitive detection limits of 100 CFU/L for the water test and 200 CFU per swabbed area for the swab test. A perfect choice for high-risk industries or in countries where there are stricter Legionella action levels.

--> Click here to compare the Hydrosense products.

Hydrosense ONE Ultra Legionella Water Test: This test can be used on water samples from any source to detect Legionella pneumophila serogroup 1 (LpSG1). The unique Hydrosense filter, included in the kit, captures any Legionella present in the sample as the water is pushed through it. This is then extracted from the filter into a solution which is dropped onto the test strip.

Hydrosense Pro Ultra Rapid Legionella Water Test. Reliable and rapid self testing of water samples from any source. This  new product is just as easy-to-use and accurate as the ONE Ultra but now detects all Legionella pneumophila serogroups 1-15.

Hydrosense Pro Ultra Legionella Swab Test: Biofilms are the slimy substance that can be found inside pipework or on surfaces like shower heads, water tanks or pools. If Legionella is present, there is a strong chance it will reside in biofilm. Now detects all Legionella pneumophila serogroups 1-15.

Hydrosense ONE Ultra Legionella Industrial Kit: If there is a need to repeat test a single water outlet in high-risk areas like commercial, healthcare and hospitality buildings with large water systems, this test kit would be the ideal choice. The test detects Legionella pneumophila serogroup 1 (LpSG1). It includes 5 tests for water sampling and the Hydrosense filter technology is delivered using the plumbing fitting adaptor (US 1/2 inch NPT and 3/4 inch BPT fittings). Simply attach the adaptor and leave it in place ready for future testing.

Click here to compare the Hydrosense products. Contact us for quantity discounts and further information about Hydrosense


  • We ship orders daily Monday – Friday (except bank holidays)
  • Fast & efficient shipping
  • Order by 12 noon for same day dispatch
  • All orders are shipped from United Kingdom (UK)

UK Shipment Options:

  • FREE Super Saver (3-5 business days): £0.00
  • Royal Mail 1st Class (1-2 business days): £1.99
  • Royal Mail Tracked 24  (1-2 business days): £2.99
  • DHL Courier (1-2 business days): £6.98
  • Special Next Day (Monday to Friday): £9.98

Order by 12 noon for same day despatch. For urgent despatch after 12 noon, please call us on 01933 664746.

European Union (EU) Shipment Options:

  • European International Shipping (5 – 10 Days)
  • International Tracked
  • DHL International Tracked

All orders to the EU are shipped including VAT so no duty or VAT to pay to customs

Please feel free to contact us for more information about international shipping before placing an order.

Rest of Europe, Australia, New Zealand and USA Shipment Options:

  • International Shipping (5 – 20 Days) from £0.80 (can vary due to exchange rates)
  • International orders outside the European Union and Great Britain are sent excluding VAT. Local VAT as well as potential import/duty fees are charged by local customs on point of import. Customs fees vary depending on product, however most of our products (ie water test kits) are duty free (0%). Please feel free to contact us for more information (ie HS Code) before placing an order.


  • We can ship worldwide – please contact us to obtain a quote for your destination

Please note:

UK Mainland Shipping Provided by:

  • Free Super Saver (3-5 business days) – This is a free service using 2nd Class Royal Mail and usually arrives within 3-5 working days. In the event that no one is at home to take delivery, a card will be left for collection from your local post office or courier.
  • Royal Mail 1st Class (1-2 business days) – This service uses 1st Class Royal Mail, costs a small fee and usually arrives within 1-2 working days. In the event no one is in to take delivery, a card will be left for collection from your local post office or courier.
  • Royal Mail Tracked 24 (1-2 business days) – This service uses 1st Class Royal Mail tracked service, costs a small fee and usually arrives within 1-2 working days. In the event no one is in to take delivery, a card will be left for collection from your local post office or courier.
  • DHL Courier (1-2 business days) This express service is usually a next working day delivery (depending on location). Being a fully tracked service, you will need to be in to accept delivery, otherwise they will attempt delivery again the following working day or you can collect from your local depot.
  • Special Next Day (Monday to Friday) – This express service by courier or Royal Mail Special Delivery, is a next working day and fully tracked service. You will need to be in to accept delivery, otherwise they will attempt delivery again the following working day or you can collect from your local depot.
  • Higher value orders may be shipped using courier at no extra cost to ensure safe arrival.
  • Mainland UK includes England, Scotland, Wales, Northern Ireland and all BFPO addresses.

International Delivery provided by:

  • Royal Mail International – Depending on the order value this is part-tracked delivery service from Royal Mail. Delivery can take up 2 weeks (depending on the destination country), however for Europe delivery times are aprox 5-7 days.
  • International Courier Delivery – Depending on the order value this is a fully tracked service and can take up to 1 week (depending on the destination country).
  • If the country that is receiving your order has strong regulations regarding the importation of goods including nutritional supplements, SimplexHealth cannot be held responsible for any additional fees incurred by Customs and/or Quarantine scanning. We also cannot accept responsibility for items returned by customs.

All delivery times are estimates and depend on local courier services as well as processing times through customs (where applicable).

I have not received my order what do I do?

If you have not received your goods after 14 working days, then please contact us and we will chase your delivery. The quickest way is to contact the team by email (quoting your order number and contact details) or call us on +44 (0) 1933 664746 (Monday to Friday 9am – 5.00pm). It is out of our control if delivery gets delayed due to postal strikes or natural disasters, however we will do our best to help solve any problems with lost items.

Returning an item

We want you to be happy with your purchase but understand that sometimes you may need to exchange or return an item. Follow our returns procedure if you would like to return a faulty, damaged, duplicate, incorrect or unwanted item. This can be viewed here or under Returns at the bottom of the screen.