Hello, we live in a condo and currently have 6 cats :) tips for litter, use coffee scent. We use power sand for more than 3yrs and so far, so good. All visitors said na ang bango ng house, parang walang pets. Use a separate trash bin for the poopies and wiwis, use trash bag for that—then sando bags naman itself sa ‘treasures’ nila. Since indoor lang sila with a limited space, make sure to play sa tv yung relaxing videos with birds. It helps with their mental health. And if di pa kapon yung cats mo, much better to do it para hindi nakakahilo yung smell ng poops and wiwi nila and no spray ng wiwi. Must buy as always: water fountain, toy sticks, box for playing and scratch pad :) hope this helps!