Skimming wet is when you're pulling out a greater quantity of water than you are when you skim dry. It really depends on your situation and preference as to which you should choose.
DannyBradley;236090 wrote: Skimming wet is when you're pulling out a greater quantity of water than you are when you skim dry. It really depends on your situation and preference as to which you should choose.
Generally speaking skimming wetter will remove more nasties from the tank than skimming dry. More of a hassle though as you have to empty collection cups more often and top off more.