I do have to admit, that the potty grass DOES help Roxy with her marking issues INSIDE
This one is the most reasonable (I have it too):
https://www.pottypatch.com/ver12/index.asp
I also have this one:
DoggiePotty Indoor dog bathroom. Doggie potty a training solution.
I hose the hell out of the grass on Saturday mornings and let it dry in the sun and I use it again Monday until Saturday again. It should last for years...
I also read that you can put the grass into a pillow case and put it in the washing machine
