Using these vacuum bags is easy. First, turn off your Wertheim 7 Series W9000 or W9000PH vacuum cleaner and unplug it from the power source. Then, open the bag compartment. Take one of the high - filtration cloth bags from the pack and place it properly inside the compartment. Make sure it's securely in place before closing the compartment. When using the vacuum, if you notice a significant decrease in suction power, it might be time to replace the bag. Remember, these are disposable bags, so once they're full, simply remove them and replace with a new one. For maintenance, keep the remaining bags in a dry and cool place to ensure their quality. Always check the bag regularly during use to prevent over - filling, which could damage your vacuum cleaner.