Plastecnic suggests you two solutions for the watering reservoir: one with net while the other with a tank and an equipped watering level.
The saucer helps the plant to have a watering reservoir. Thus, it is important to choose the right saucer.
Plastecnic pots have holes on the bottom that allows the water to leak down and the aeration of the roots. This latter role is made thanks to the holes applied on the draining holes placed on the cross.
Pots without holes (or cover pots) can be useful to grow the plant.
The overflow towers are designed to drain the exceeded water, ensuring a minimum amount of water reservoir.