Hello Ophir in- We’re sorry to hear that the WP‑580 did not meet your expectations. This model is designed to be compact and portable, making it well-suited for travel and small spaces, but we understand that the smaller reservoir, the need to refill, and the lower pressure may not be ideal for every user. While the pressure isn’t as high as our countertop models, it still provides effective water flossing. For users looking for stronger pressure and a larger reservoir, a countertop may be a better fit. We do offer a 30‑day money‑back guarantee. For more information or assistance, please email smreviews@waterpik.com or call 1‑800‑525‑2774.