Having worked for almost 5 years as a vacuum cleaner repair technician for many different brands and as a branch manager selling and servicing well known brands of vacuum cleaners, I can confirm that HEPA, ( High Efficiency Air for Particles) Vacuum cleaner filter bags are a very real and important part of a vacuum cleaner. I can also say that the Riccar name is one of the top 3 vacuum cleaner names in the business. I have owned the same RSL4 Riccar Supra-lite model (including two speed motor) since 2005 and always use the HEPA filter bags made for it. We have 2 cats and live next to a major highway which makes me vacuum (yes I vacuum) at least once every 3 days. The HEPA filter has a minimum required filtration efficiency of 99.97% and these certified bags filter out particles down to 0.3 microns. It's not much, but some of the most common allergen particles in the average home are little larger than this. Well worth the cost for a box of 6 of these HEPA filter bags. As I said before I need to vacuum at least once every 3 days and a box of 6 of these bags will last you 6 months. Each pack has a built-in "Close" slider, which is very handy when it comes to switching packs. . You simply open the used bag, insert the built-in door into the opening, and then pull the bag out of the protective outer pocket to dispose of it. Installing the bag is even easier and the easiest to install or remove from any vacuum bag I've ever seen. removal process. In fact, they are so well made that I have a hard time understanding how they can be made and sold at such a low price. Of course, you can get regular paper bags for less, and that's what you get, a paper bag. With HEPA bag filters, however, you not only get a "container”, but also a very high-quality filter. I can only recommend these bags! If you find any of the 5 Ebola viruses and other very dangerous Level IV viruses and bacteria on your carpet, it is the HEPA filter that scientists and researchers use in these very exclusive research facilities for protection. (Note to microbiologists who may be reading this: while some Ebola microbes can be up to 25% smaller than 0.3 microns in diameter, their overall length is typically 0.8 microns or more and is therefore retained by filters.) . BSL Laboratories -4 will use multiple HEPA filters to pass the exhaust air ([.]). If I think they can rely on a HEPA filtration system to protect against such germs, I can rest assured that it will keep out the many types of allergens and the like that get thrown back into the air when vacuuming! When to change the vacuum cleaner bag? Many people tend to overfill their vacuum bags before changing. In fact, it's so common that it's one of the top three reasons a vacuum cleaner stops working. The fact is that the bag (even paper) in your vacuum cleaner is a filter. It absorbs incoming dirt, but must be air-permeable. The more the bag is filled, the less air can flow through the bag per second, and as this dirt continues to collect on the inner surfaces of the bag, a certain amount of less air can escape per second. My Riccar Supralite weighs just over a gallon of milk. On the Riccar Supra-lite, a vacuum that weighs about 9 pounds, I change the HEPA filter bag when it develops cylindrical buildup about 5 inches high and 4 inches (wide) from heavy debris. the bottom of the bag. That equates to maybe 1.5 or 2 pounds and actually the maximum I allow before changing bags. I know the pouch has been used for a month and has absorbed cat and human hair, skin cells etc. I also use a small amount of carpet powder, during this time the inside of the bag gets covered in dirt. and the suction power is not in the "optimal average". So that 'roll' of 'heavy' dirt at the bottom of the bag is my 'indicator' and if I hadn't spent a month with that particular bag I would still change it rather than time with less power to waste. than I expect from a vacuum cleaner. Note that using carpet powder may affect the suction power of the vacuum cleaner. This is because the carpet powder starts to clog in the bag and therefore reduces the exiting airflow, reducing vacuum suction (the X amount of air entering per second depends on how much air is able to escape from the container per second). That doesn't mean you can't use carpet powder, it just means you need to use it sparingly, and if you use it frequently you might want to change the bag more often. An alternative to carpet powder are carpet care granules. They work like powder (you just spread it lightly on the carpet and leave it on for about 30 minutes and then vacuum it up). Larger granular particles are heavier and therefore fall to the bottom of the bag after vacuuming. The powders are usually carried away by the circulating air inside the bag and then coat the inside, effectively reducing the flow of escaping air, as I mentioned earlier.