We had eleven cats at one point (now we have four) and we did not have a flea problem as long as we kept the cats indoors. Recently, a wild cat from outside ran into our home and infested our house so we have fleas again. But whenever we have a flea problem, using flea medicine is good enough. We never had to flea bomb our house and they would all eventually die and never come back. Some flea medicines work better than others though. Whenever my mom catches a flea on her she would have a cup with water mixed with dishwasher soap nearby and dunk the flea into the soapy water and leave them there for a while. They would die and we would dump it out. My dad believes that vacuuming up the fleas helps but my mom thinks that they will jump out or that they would make eggs and they'd hatch so she would dump out the bag afterwards. Right now we have some flea carpet powder on the floor and it does not help because the fleas are still here. We are simply waiting for the next time we can put flea medicine on our cats since my dad wanted to save money and bought a cheaper medicine that did not work the last time.