Hello .. its not filters you need to purchase but new resin, about £50 for 22l (2 refills)
I like the Aqua gleam tube but cant see why they cant make it reusable .. like a screw top with a o ring seal for example ... I am thinking of modding mine
Totally agree the DI filter is the way to go last much longer and cheapish to refill with resin when required
Had mine since June used at least once a week and still producing 0ppm
