Okay. I've been following this thread because we developed a litter problem this year. We were using clumping cat litter because my DH thought the Feline Pine was outrageous. Since I got pregnant over a year ago, he has been in charge of the litter, and he is not as diligent as I am. We moved the litter to the basement in January in preparation for Maddy's arrival. At first, it was fine, but DH got lazy/sloppy and wasn't cleaning the litter frequently enough. Before you know it, the cats were marking elsewhere in the basement and pooping right outside the box. 
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I had a c-section, and then a high-needs baby, so DH stuck with litter and laundry duty (both in the basement). I've ventured down there a couple of times for tornado sirens this year and discovered what an absolute health hazard it is. Last night, I reclaimed my territory. I completed scrubbed down and disinfected the basement. Scrapped the crappy litter, and refilled the box with Equine Fresh (I swear it's the same stuff as Feline Pine, but I paid $5 for a 40 lb bag at tractor supply.) Thank you so much for that tip! I love it!
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The basement smells like basement (kinda musty) and woodshop. :) So much better than ammonia! Yay for these suggestions!
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However, the cats are still pooping just outside the box. Any tips to help get them reacclimated with the litter box? I did also add another box downstairs. 2 cats, 2 boxes. That was another recommendation from this forum.
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Sorry for hijacking, but I love the tips!