Dyson Air Filter

It happens about every six months. I get a reminder that a new air filter is required and it’s time to order. That’s what Dyson does. Everything is set with an app and you can control the humidifier/air purifier/fan from the app. It also tells me when to clean the water system with citric acid. There are also many real time air quality reports and humidity indicators. So yesterday the filter arrived and it was time to switch it out. They are quite substantial  - there are two large pieces. You know why it needs to be changed when you compare the used one with the new one. Nevertheless all of these filters get to be quite an expense. I hope it’s worth the bother. I still see so much dust around the house within the week of cleaning. What did we used to do in the old days?