Terrible cat smell- ozone suggestions?

[Megan Penman]

I purchased my first real rental this weekend and it has a terrible cat urine smell throughout the house. I am have ripped up the carpet, and padding to find old linoleum flooring on top of the subfloor. Has anyone used http://www.maxblasterusa.com ? or are there better options? Do I need to remove the linoleum and subfloor too?- it’s a 1957 slab home. Thanks for the help!