In the run-up to the test, we defined practical requirements and the following test criteria:
In order to be able to evaluate these criteria, we have defined several tests for the water bottles. First, the scope of delivery is checked. This is used to assess how easy it is to remove the lids and whether the bottles fit well in the hand. In the first test runs, the bottles are filled with still water up to the maximum capacity. Once all the bottles have been filled, we test how tight they are and whether they are leak-proof. Then the wrong bottles are drunk and the drinking experience is judged. The process is repeated with carbonated water on all bottles. All bottles are then dropped from a height of one metre to check their robustness. Finally, the bottles are cleaned by hand and, if possible, in the dishwasher.
In order to rule out errors and to ensure that the bottles are not exposed to the stress of everyday use, each test is carried out in several stages.
The test criteria are given percentages depending on their importance. The final score is then objectively calculated from the test criteria using an algorithm.
Our product selection is based on an observation of the current market. In addition to popular branded products, we also include insider tips in our selection. Criteria such as price and range of functions are an important factor for us. The test field is also determined by analysis and evaluation of customer reviews and external tests (e.g. Stiftung Warentest).
The devices are purchased anonymously or lent to us by the manufacturer. Dealers and manufacturers have no influence on the tests and our evaluation.
As soon as new relevant products come onto the market, our test field is extended by these. The new products go through the same test as the already tested devices.