According to this telegraph article : “an Ipswich-based businessman invented a £190 bottle that makes foul-smelling water drinkable in seconds.”
That’s about US$380 over here. Each bottle can filter 4000 or 6000 liters without changing the filter.
Also the bottle can make fecal matter safe to drink because it filters anything longer than 15 nanometres. This means that bacteria which are smallest at 200 nanometres(filterable by conventional water filters) and even viruses which are usually smallest at 25 nanometers can be filtered.
If it matches the claims then it’s probably worth even more than that price.