Got 4 filters for about the same price as 2 would have cost from home depot and it was delivered to the door in 12 hrs. They filter faster than the expensive ones. The filters are the easiest to change.

Filters work just as well as zero water, at least according to the digital meter that measures total dissolved solids. The only thing i can't review is their longevity, but i don't expect it to be any different than zero water.

Water smells fishy when it needs changed, not sure why. This item is not antimicrobial like the real zero water filter cartridge. Who make a filter for zero water that doesn't end up making fishy smelling water?

One package of 4 aqua crests only lasts me 1 month. They last maybe three weeks while the brand ones that came with my pitcher last at least five.