Besides formaldehyde, why is it "expensive"?

"Expensive" is for a reason! Everything has a price. If the price is low, it can only be said that the cost is low. See if it's worth it But the criterion for judging value and unworthiness is: can it solve the problem of consumers?

Should we go back and think about it? In addition to formaldehyde? This question. The root of this problem is that only by continuously removing the released formaldehyde and the removal speed is greater than the formaldehyde release speed can the indoor formaldehyde concentration be effectively reduced. Through various methods, the speed of formaldehyde removal can be maximized, and the indoor formaldehyde concentration can be minimized. That's the point.

So anything expensive makes sense. Different values lead to different prices.