In use of liquid absorption, there is an internal motor protection filter, a "float" for additional protection. So, when there is demanding work, it INTERRUPTS the suction very often, which is very frustrating. What can I say, I have no experience with other vacuums, but the truth is that it tired me a lot until I completed the cleaning of a small "well" of accumulated rainwater sludge, 1.5m deep. Additionally, if you want to collect ash from the fireplace, the instructions say to do it using an "ash pre-separator" beforehand (ATTENTION Vacuuming cold ashes: Device damage / Only vacuum cold ash with an ash pre-separator.). This is an ADDITIONAL bulky and extremely inconvenient device, I mean what device, it's just a bucket, worth 62€ (09/2023)!!! Ridiculous!!! Instead of installing a decent filter for this job... Supposedly it is a solid vacuum, unless ash is a separate category of material. The aforementioned exception is not even mentioned in the company's advertisements and you discover it after the purchase, deceiving the consumers. What can I say, shame on Kärcher... Very dissatisfied, I did not expect it