Coolblue?

Coolblue has good service and installers and stuff, but I find they have a (probably intentionally) limited range of stuff they sell. But that's fine, I really have no interest in e.g. the bottom of the price range for appliances.

Tweakers.net probably has more specialized filters I'd imagine.

Coolblue in this case, and they do have this specific filter:

https://www.coolblue.nl/wasmachines/filter/bediening-via-app...