english: While TiO2 is safe and inert, it's really inefficient if you keep drinking the catalyst, because then you have to continue to replenish it, even after a few uses.
non_english: Terwijl TiO2 veilig en inert is, is het inefficiënt om de katalysator op te drinken, want dan moet je hem navullen, zelfs al na enkele toepassingen.