You need to treat your couches and chairs as well, where kitty my jump or lay. You should also treat the outside of your house and yard. We had the same problem briefly while in Texas, but easily cured the problem using a systematic approach for the house, yard, and kitty, with a couple follow-ups to get any hatchings. It worked fine and kitty could still run outside.
Then we had to keep washing all of the sheets, blankets etc for 4-6 weeks on a regular basis (every 3 days???).
And leave the carpet alone for the first day or two, and then vacuum everything (carpet, hardwood, couch) every day for several weeks. (Due to the hatching cycle - and the vacuum motion and heat causes them to hatch).
It was a lot of work - but they guarantee it for a year.