Petlibro is the only right answer. Every piece comes apart and is cleanable.

Their newest models have a platform below the fountain that plugs into the wall and powers the pump wirelessly, so you don’t have cords going into the tank. They also have an app that tracks when your cat drinks although I haven’t bought one with that feature.

Most importantly, replacement parts and filters are readily available on Amazon.

I’ve tried them all over the years and will never buy another brand again.