I use Natures Miracle and I like it.
I think this stuff works.
As for how long I keep the same pad, it is depending on how stinky it gets!!!
My Momiji can care less if it was used 5 times or only once.
She still uses it after 5 use!!!
I just can't stand the urine smell so I change it twice a day.
When I leave for work, I put new one and I put new one when we go to sleep.