i bought these and found them to work perfectley
i used another brand that would let dust collect on my evaporator coils and late in august i would get water on my wood floor/s well after blowing my coils out with foam cleaner and a shop vac you wouldnt believe the trash i seen these in walmart/s so i bought 1 worked like a champ so i buy a case at a time i change them once a month . trust me the energey cost alone at 8 dollors they will save you that easy