You can use coffee filters. Before I started using the Lipton Pyramid Tea Bags I used regular tea bags and coffee filters. Both work, but the PTB's worke so much better. They don't effect the taste the way the others do and they wick so much better. Plus you can wash them out and use them over and over. I bought a box a month ago and only half are gone. The only reason that many are gone is because I have given them to other people to try and because I got a 510 and the ones I trimmed to fit my 901 didn't fit the 510. I have yet to have to throw one away. Occasionally I have to trim off a frayed edge from pulling them out of the atty with a pin or my fingernail, but I haven't found any of those strands sticking to my atty and they are never singed like the polyfil was if strands of that got loose.