Eheim 4002650 vents for air pump Eheim Air Pump

These vents let's go new ways.
It is adjustable and has only a small inside perforated felt pad or similar material, the farther the ball closes the less air flows into the pool.
We were tired of throwing the traditional outlets after two months away, as fast colonization by algae pores and then nothing works.
With this type, there should be no problems there, am curious what will happen in the time !!!!