Fleas are so hard to get rid of! They could be sand fleas coming in with the cats from outdoors, but they will hatch out in the house in carpet, bedding, and upholstery.
The best way to control fleas is to start a dedicated programme that includes very frequent vacuuming of hatching favoured areas, spraying or dusting the house with a flea-rid product making sure to read and follow the directions to the letter, and of course preventive measures on the pets.
Flea collars don't really work. If your cats go outside they will get new fleas on a regular basis. Housecats, treated with one of the long acting flea products become flea free pretty easily. My housecats were treated once about 4 years ago and I havn't seen a flea since then. If your cats go outside you will need one of the long acting products and will need to use it on a monthly basis. Frontline seems to be losing it's effectiveness so it might be best to start with one of the other products.
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