After a few prints, or after any failed print - I dump the vat through the attached filter jar. When I pull the vat out, I always pull it out into cling-film to cover the base and prevent fingerprints.
Where’d you obtain this? Is it for sale somewhere, or did you build it yourself? if so, out of what parts? (=
Also, did you print the case? That looks like it might be the black resin.
Thats cool. I use a plastic fine strainer from a cookware shop to do the same thing. 
It’s home-made.
- white plastic tub with screw top
- black duct tape wrapped around tub
- thin aluminium sheeting cut with scissors and glued into cylinder with araldite
- wire mesh from kitchen sieve cut with scissors and glued in with araldite
I use a 190 micron paint filter. Works amazingly well and has improved my print quality radically.