Another helpful thing to do which can accomplish almost as much as the bathing weekly is to take a wet or damp washcloth and rub the cat down with it—daily if possible.
The main reason that the bathing and washing help so much is because it’s not the pet hair to which one is allergic. It’s the dander on the hair. This is a protein substance which is contained in the cat’s saliva which is deposited constantly by the cat continuously grooming itself.
It then dries and flakes off every time the cat moves. Obviously this is so light it’s in the air, on furniture, drapes, rugs etc. so frequent vacuuming and an air filter helps with that part of it.
But since most of it ison the cat, wiping down or bathing the cat gets rid of a lot of it. I’m guessing that’s what the Allerpet also does.
If you are seeing an allergist, you can also ask about desensitization shots made from your own cat’s proteins.
That’s a fairly new development but it makes a lot of sense. The common thing which is done is shots based upon a generic cat (or dog) substance. To me it makes so much more sense for it to be made based upon the same cat as to which one is allergic.
But ask your own Doc to see if it’s an option in your area.