Dolphin Liberty 400

A sound-activated pickup. When the cycle is over, tap the surface of the water at the edge of the pool and the robot drives to that wall and surfaces, so you lift it without a hook or a cable.

The 400 adds the MyDolphin Plus app over Bluetooth, an Advanced Eco Mode with three weekly programs instead of one, and a three-year warranty instead of two. Pool size, coverage, filtration, Click-Up and inductive charging are shared.

Unpack the robot and remove the plastic wrap. Plug the charger into a wall outlet in the shade, connect it to the robot, peel the protective sticker off the power button and charge until the battery LEDs are all solid, which takes up to six hours. Unplug the charger, press the power button for less than four seconds, and set the robot in the pool.

Always charge in a shaded spot between 41°F and 95°F. While charging, the battery indicator blinks and steps up a bar at a time until all three bars are solid green.

Eco Mode lets a cordless Liberty stay in the pool for up to a week on one charge. On the Liberty 200 (2024 and later) and Liberty 300 it splits the battery into three 30-minute cleaning sessions with a 48-hour rest between them. The Liberty 400 has an Advanced Eco Mode with three programs: 40-minute floor-only cycles every 48 hours (three sessions), 60-minute cycles every 72 hours (two sessions) or 30-minute cycles every 48 hours (four sessions).

• Charge the robot fully.
• Press the power button to turn it on. Once the battery LED is lit, hold the power button for five to eight seconds until the LED blinks purple three times, then green three times.
• Put the robot in the pool; it starts within 30 seconds.

To cancel Eco Mode, hold the power button for four seconds or connect the charger.

Cordless Maytronics robots, including the EON and the Liberty 400 and 600, lose their Wi-Fi and Bluetooth connection as soon as they are under water. That is normal. Connect the robot to the app before you put it in, set the cleaning mode or weekly schedule you want, then place it in the pool and it runs the program on its own. When you lift it out, the connection comes back automatically. Corded Dolphins stay connected the whole time because the power supply on the deck does the talking. Note that the Liberty 400 pairs by Bluetooth only, through the MyDolphin Plus app.

Balanced water. Too little chlorine lets algae clog the filters and starve the motor of flow; a pH above the recommended range stops the robot climbing walls. After a shock or flocculant treatment, wait 24 hours before the robot goes back in. Keep the water between 43°F and 95°F; below 59°F, climbing suffers.

• Alkalinity: 80 to 120 ppm
• pH: 7.2 to 7.6
• Calcium hardness: 150 to 250 ppm
• Free chlorine: 1.0 to 3.0 ppm
• Cyanuric acid: 30 to 50 ppm

Saltwater pools are fine up to 5,000 ppm of salt. Rinse the robot with tap water after each cycle to stop deposits building up.

It is better to take it out after each cycle, empty and rinse the filters, and store it dry out of the sun. Models with a weekly timer or an Eco mode are designed to stay in for the week they are scheduled, as long as the water is balanced; clean the filter at the end of the week. Whatever the model, lift the robot out before anyone swims.

Dolphins ship with fine spring filters (about 100 microns) that catch leaves, twigs and grit. Many models also include ultra-fine filters (about 50 microns) for sand, dirt and algae, and some accept a super-fine insert that filters down to 30 microns. Use the fine filters for spring opening and heavy debris, and the ultra-fine set for everyday cleaning. Ask us for the replacement filter set that fits this model.

Register online at registration.maytronics.com with the robot's 10-character serial number and your Pool Express receipt. The serial number is printed on the box label, on the warranty card and on a barcode label inside the robot's housing. The form asks for the serial number, your details, the purchase date and store, and an uploaded receipt or invoice showing the date, product and price; then you agree to the terms and submit. Keep the confirmation with your receipt. Because Pool Express is an authorized Maytronics dealer, the full 3-year warranty applies.

Yes. Pool Express is an authorized Maytronics dealer, so every Dolphin Liberty 400 we sell is a new unit that registers with Maytronics for the full manufacturer warranty, and our Pool Pros handle any warranty question for you. Buying from an unauthorized seller can void that coverage, which is why Maytronics asks you to buy from a dealer. You also get our 30-day trial and low price guarantee.