---
title: GUARANTEES
url: "https://www.purion.de/en/areas/water/information/guarantees/"
date: 2025-01-09
modified: 2025-01-09
lastUpdated: 2025-01-09
---

# GUARANTEES

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5. GUARANTEES

   GUARANTEES
------------

 **Independent experts were able to confirm:**

... For all three test bacteria examined, the use of the PURION 1000 UV disinfection device resulted in a significant reduction (see table).

 **Reduction of the test bacteria:**

| **Parameter** | **Colony count at 36°C** | **Pseudomonas aeruginosa** | **Escherichia coli** |
|---|---|---|---|
| Concentration in the influent (mean value) | 8,540/ml | 388000/100 ml | 1,360,000/100 ml |
| Concentration in the effluent (mean value) | 0.4/ml | 5.6/100 ml | 0.8/100 ml |
| Reduction factor\* | 4,33 | 4,84 | 6,23 |
| Reduction factor | 99,9953 % | 99,985 % | 99,9999 % |

\*Reduction factor = log10 bacteria concentration in the inlet - log10 bacteria concentration in the outlet

 In the case of Enterobacter cloacae, as the test organism for determining the colony count at 36°C, the UV disinfection device reduced the test organism by approx. 4 log10 levels, i.e. 99.99% of the test organism was reduced. In the effluent, the limit value of the Drinking Water Ordinance for the colony count at 36°C of 100 CFU/ml was easily complied with in all five samples. The maximum value in the effluent was 1 CFU/ml (in two samples). In three samples, the value was 0/ml, i.e. the bacterial concentration was below the detection limit of the method.

In the case of Pseudomonas aeruginosa, the bacteria were reduced by almost 5 log10 levels. On average, Pseudomonas aeruginosa was reduced by 99.9985 %. Small amounts of Pseudomonas aeruginosa were still detectable in the effluent of the UV disinfector, on average 5.6 CFU/100 ml.

In the case of E. coli, the bacteria were reduced by approx. 6 log10 levels. The UV disinfection device reduced E. coli by 99.9999 %. Minimal amounts of E. coli were still detected in three samples in the effluent (1 or 2 CFU/100 ml). Two samples were free of E. coli in 100 ml.

**Overall, the UV disinfection device PURION 1000 can be confirmed to have very good effectiveness during the conducted test operation. The test organisms used were reduced by 4 to 6 log10 steps under the described experimental conditions.**

Assuming a minimum reduction of bacteria by 4 log10 steps, water with colony counts up to a maximum of 10^6 CFU/ml or E. coli concentrations lower than 10,000/100 ml can be disinfected using the PURION 1000 UV disinfection device under the described experimental conditions, ensuring that the microbiological limits of the Drinking Water Ordinance are met.

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