Product review (3 stars): Filters last about 6 weeks
To make the filters last a little longer we use the water treatment solution and the filters last around 6 weeks with our well water. We put a cap full in each tank every time we refill them. About 3 weeks into using a new filter I rotate the filter because the water doesn't seem to wick all the way up. Overall we like the unit and it does a great job of keeping the house humidified.