The Leaf Trap prevents clogging of pool pipes and equipment by essentially attaching a debris catcher between the vacuum hose and the skimmer. The trap is larger than the average pump basket to allow for easier and longer vacuuming. The universal design ensures it can be used with suction cleaners and manual vacuums. Anytime you manually vacuum and clean your pool, the vacuum hose requires you to remove your skimmer basket which exposes your system to sticks, leaves, pine needles and acorns while you are vacuuming. These objects can potentially get stuck in the underground plumbing which will plug up your system and require a service call to correct the problem. Having a leaf trap eliminates the possibility of this happening as it adds a catching cannister to the otherwise exposed system while vacuuming so any debris that could get stuck in the plumbing is trapped in the cannister instead. It also saves time because the cannister is much larger than your pump basket. For anyone who has vacuumed a pool before, you know that once the pump basket is full you have to stop everything, empty the pump basket and reprime the system to keep cleaning the pool. This whole step is eliminated with the leaf trap since everything will be captured in the cannister vs the pump basket. This means no having to stop mid way and restart. The Pentair Leaf trap is used by all Lakeshore Pools service staff when vacuuming any pool to save time and protect your system.