Waterpik Nano Plus (WP-320)

The Waterpik Nano Plus (WP-320) is specifically engineered for modern urban environments where bathroom counter space is at a premium. Mechanically, it retains the core pulsatile technology of full-sized Waterpik models, generating a 1,400 PPM water column that is clinically optimized for biofilm disruption. While it is 50% smaller than standard countertop units, it delivers a robust pressure range of 10 to 100 PSI across five adjustable settings. The 15-ounce (450ml) reservoir provides over 60 seconds of continuous flossing time, significantly outperforming handheld cordless units in session longevity. Architecturally, the Nano Plus features a unique inverting reservoir design that doubles as a protective cover for the base during storage or travel. Its global voltage compatibility makes it the only 'travel-capable' corded countertop model in the current lineup. However, clinical testing notes a lack of a reservoir lid during active use, which may raise hygiene concerns for some users, and the reduction to five pressure levels provides slightly less titration precision than the ten levels found on the Aquarius series.