One of the challenges that comes with reusing water bottles is keeping them clean and free of smells and odours.
I think back to the time I put a smoothie in my old plastic water bottle and really enjoyed it that day. Unfortunately, the bottle then carried a stale smell from the smoothie and ruined the water that I tried to consume from that bottle for ages afterwards.
The odour is actually coming from the very small quantities of fats and proteins from the milk that remain adhered to the surface of the plastic and are then subject to microbial action by little bugs like Streptococci, Lactobacilli and Bacillus cereus. The ones that cause milk to go sour. This whole brew forms a kind of bio film on the surface of the plastic.
Plastic surfaces, being organic (carbon based) compounds, have a stronger attraction to other organic compounds like fats, proteins (and bugs) than to water. Plastic is said to be hydrophobic, or ‘water hating’ in Greek. By contrast glass, or metal surfaces like stainless steel, are more hydrophilic (water loving) and therefore much less attracted to organic fats proteins and bugs.
This is why it is harder to get plastic surfaces really clean and given that the insides of water bottles are notoriously difficult to access and clean compared to regular kitchenware, it is perhaps no surprise that plastic water bottles tend to develop odours from milk based or other organic based drinks, banana smoothies for example.
For those who remember the old glass milk bottles (they were even delivered to your door!), you knew from the many wear marks and scratches on the outside of the bottles that they were used over and over again. This was because, on return of the empty bottle to the milk supplier, the glass bottles could be easily cleaned to a very high standard. Similarly, food and drink processing equipment are invariably constructed in stainless steel and glass to maximise the efficiency of cleaning between batches.
There is a plethora of information online on how to remove odours from plastic containers using specialist cleaning techniques however they all seem to require much time and effort. Cleaning bottles is not something I (and I suspect most people) like to spend time and effort on!
Knowing how tough it can be to keep plastic surfaces clean and odour free, we wanted to find a way to cut down on plastic internal surfaces and eliminate hard to reach areas.
Drawing inspiration from the food industry, here at Ever Vessel, we’ve focused on easy to clean drinking vessels bottles without hidden crevices and with minimal or no plastic touching contents.
Many stainless steel and glass bottles have surface coatings, hard to reach areas or built-in electronics — especially inside the lid that may make them harder to clean. Many aren’t dishwasher-safe or can’t be submerged in water.
There are many factors to consider when choosing a suitable water bottle. Best to do your research and choose wisely if you want an odour free water bottle.
