@Kerry Beal, you are probably right. I just used pectinex that I had in my pantry for about a year, and it worked!
I sous vide orange juice and strawberry mush for about an hour at 35 degrees and then I strained them and passed them through coffee filters.
The yield was low but remarkably clear!
I had some problems with the filters. I think I should use Chemex which are stronger.
Anyway I am going to use some other product now. I am about to buy vinoferm zymex and some other enzymes and compare.
In a very utopian future, I will buy a centrifuge, but I am not a chef or anything, and perhaps spending 2.5k for a centrifuge may not worth it.