Got a couple of them, dumped mostly by previous Chinese owners. Here is the best one, I use it 24/24 in my office. At least should protect me a little from all the bad stuff in the air. Maybe not all the PPM10, but let’s just be positive.
Brand: SUNPU, model KL-100, “Air Purifier Ionizer”.
The purifier was basically in good working condition and just needed a good cleaning. I don’t even bother to find replacement filters and other parts (like the perfume capsule) – I never get hold of the manuals and service address.
I just give them all a good shower with warm water. But do NEVER open the inside of the filters, most have layers of paper that will disintegrate when wet if you do so. Carefully showering them in the bathtub leaving them inside the filter house is OK, but do remove the cover filters to wash them separately. Having replacement filters should be better as some of them probably contain active carbon that is gradually washed out. Anyway, the filth coming out of the filters is just unbelievable, so they do help. Not sure if the “Ionizer” really works.

The model works pretty well, except for the air flow indicator (to warn the filter is dirty); it is merely for decoration.
As said, I am on the receiving end of dumped consumer goods that I try to repair and recycle. At least, each time I succeed, it is one electronic equipment less to spoil the environment. Just recently I saw an abandoned toaster in Julong.
Curious, I took it thinking I could give a try to repair it. Well, guess: it was in perfect order and needed just a good cleaning. As good as brand new.

Welcome to the new Chinese consumer society. Buy, use and throw. Imported habits from the USA, master is consumer excess and wasting resources. The previous owner has … US links but I won’t tell more. At least he had the thought to leave it in a visible spot, probably thinking the cleaners would use it for scrap iron or something. Could have been worse.