Our in ground pool is cement. We live near a corn processing plant which result in small corn particles in the air which settle in the bottom of the pool and leaving a stain. Prior to buying our Dolphin we drained the pool to scrub the stain every spring. Very costly to replace water. We bought our Dolphin early last spring and used it every day from pool opening to closing. No more stains. Dolphin is excellent!

Vacuum’s very throughly. Easy to clean. Wi-fi so you can clean your pool from anywhere! Keeps the pool beautiful so it’s ready when you are!

I really miss the BAGS from the previous Dolphins. The bag held a log more compared to the basket. I do understand that with more "Intelligence" built into the S400 the more controlled the system must be. Otherwise, I love me "Robie 3"!!

Highly recommended. Keep pool clean in between service.

Joking aside the Dolphin S400 is great for your pool maintenance. We have been using our Dolphin for over 6months and we use the pool occasionally. Dolphin keeps the pool clean and fresh so that every time we take a plunge we have the best experience.

Having used a navigator for the last 35 years, our new Dolphin S400 eclipsed the scope of what we wanted a pool vacuum to do. Fully programmable, climbs the sides and edges of the pool and overall does a super job of keeping the pool clean.

Awesome robotic pool cleaner. Easy to assemble and operate. I use the app to program my needs and it takes care of the rest. Picks up a lot of debris. The only thing I had to do is get a different type of replaceable filter. I found that the screen version is a lot better than the fabric that came with it.