To be honest, I'm not sure, so I can't say for sure. Can anyone recommend a good pressure washer? I've been searching the Internet for a long time, but I can't find a suitable one.
To be honest, I have never thought about the fact - why a pump with a special soap liquid does not foam. I have been using such a pump for about three years and have never had any problems with foaming. In my case, the pump has a special compartment for soap solution, so foaming does not occur...