De or het vochtafscheiding?

The correct Dutch article is:

de vochtafscheiding

Rule Words ending in -ing: almost always de. See the rule

How to use vochtafscheiding

the vochtafscheidingde vochtafscheiding
this vochtafscheidingdeze vochtafscheiding
that vochtafscheidingdie vochtafscheiding
our vochtafscheidingonze vochtafscheiding
your vochtafscheidingjouw vochtafscheiding
every vochtafscheidingelke vochtafscheiding
which vochtafscheiding?welke vochtafscheiding?
a big vochtafscheiding / the big vochtafscheidingeen grote vochtafscheiding, de grote vochtafscheiding