Purize filters are best in the activated charcoal segment.
I tried with different filters but with each one i could feel that after 1-2 puffs charcoal bits are leaking out of the filter. Waste of 700 rs. as i couldn't event use them.
Buy three of these in one go. They are delicate. Your body will thank you for this little purchase. I tend to break mine so I always get a few in one go. Handle careful but go do it.