Difference between "filtered" "triple filtered" and static?

Few months ago, my cousin introduced me to static. smoked for over 20 years and not long ago discovered this static. (Late to the party I know) Long story short, liverpool seems to be dry for static. But people have "filtered and triple filtered" Static is slightly more expensive but I cant get hold of it, is this triple filtered and filtered worth a purchase? What's the difference between the 3? Ive made bubble hash and all sorts over the years but these new names i haven't got a jar of glue about the difference in these 3.