Okay, I’m a professional pest control technician. Here’s what you need to do.
Don’t try to do this yourself. It’s difficult enough for someone with the right equipment and training to do it. And it’s not exactly the safest thing for a layperson to do, either.
Make sure you contact a reputable pest control company. They should give you a pre-list of things to do before they come out. Follow them to the letter. They will also probably give you a list of things to do after the treatment. Follow them to the letter also. It may be that you will need more than one treatment. This is not uncommon. Therefore, ask for a 30-day guarantee, and make use of it.
If I explain to you the ins and outs of flea biology and reproduction, you will at least understand the whys and wherefores of what you are told to do.
The first thing you need to know is that flea eggs can lie dormant for a long time. Consider what their life is like in the wild. They may find a host animal and lay their eggs on it, but the eggs may get brushed off, or the animal may die. So, in order to survive, the eggs have become conditioned to respond to certain stimuli, mostly vibration, which would indicate a living host.
So…vacuum the carpeting and floors in every room. Yes, even the bare floors. Yes, even the bathroom and basement. Flea eggs will lie dormant anywhere. Vacuuming stimulates them to hatch. The PC company will tell you to vacuum all over the morning they are to do the service. When they come in, you should be ready to leave the house for about four hours or so.
The technician will go through your house fan-spraying every inch of floor space and possibly even the drapes and upholstery. He should use an insecticide labeled for adult fleas mixed with something called Precor[sup]tm[/sup], which is a pre-emergent flea control. It is an Insect Growth Regulator that either stops the eggs from hatching, or renders the hatchlings sterile, I’m not sure which. There may be other pre-emergent products available, but make sure they’re using some kind of IGR in their solution. This is vital as it breaks the life-cycle of the fleas, which is essential if you’re going to rid yourself of the problem.
As I said, you’ll probably have to stay out of the house for about four hours. When you return, you should vacuum again. It’s a lot of work, but it is effective.
You may need to have a follow-up treatment in 3 - 6 weeks. Hence the guarantee I mentioned above.
I’ve never heard of boric acid ground into the carpet to treat for fleas. It won’t do much for the ones that hatch, I don’t think. An IGR is the way to go. Ask about it specifically.
And follow the directions of your PC tech completely. You need to work as a team in order to defeat this problem.
Good luck.