If you plan to close your pool during the winter season, you should remove and store the WaterGuru Sense and store it indoors.  Proper storage ensures that the device is not exposed to freezing temperatures which will damage the SENSE and invalidate the Warranty.

SENSE S3

To shut down and store the WaterGuru SENSE S3 device during the winter season or if not being used, follow these steps:

Note:  An App update will be available for download from the App Store and Google Play the week of October 5th, 2026 for SENSE S3 winterization.  You will need to update to the latest version in order to winterize your SENSE S3. 

Update the WaterGuru App

iOS / Apple App Store

1. The week of October 5, 2026, launch the Apple App Store
2. Search for WaterGuru
3. Download and update your iOS WaterGuru app to the latest version
4. The latest iOS WaterGuru app version is v. 7.0.8 (278)p 
5. Here is how you can check your App version:  How do I find the SENSE App version?

Android OS / Google Play

1. The week of October 5, 2026, launch Google Play
2. Note:  When Android app updates are pushed, they are not available immediately for all Android OS users. Android App updates are rolled out slowly. Android users will will need to wait until the app update is available for download in their region
3. Search for WaterGuru
4. If there is an update available, tap Update
5. The latest Android WaterGuru App version is v. 7.2.1 (456)p  
6. Here is how you can check your App version:  How do I find the SENSE App version?

Ensure the App is updated to the latest version and the S3 is charged and connected to your Wi-Fi network

1. Launch the WaterGuru app
2. Tap the Settings (Gear) icon in the upper right-hand corner
3. Tap Device Info
4. "Last Connection" should show the current date and timestamp within the last 30 minutes

Pool / Spa device removal

1. Take the S3 out of the pool or spa
2. Remove and dispose of the cassette.  Cassettes that have been partially used cannot be stored. Partially used cassettes that were exposed to water dry out and will not measure accurately
3. Take the SENSE S3 INDOORS to prevent damage due to exposure to temperature extremes
4. Using an old towel, remove moisture from the underside of the device, the cable and the cassette holder
5. Place the device in a box that can be closed to prevent bright light hitting the solar panel and waking up the S3 during winter storage

App Winterization 

1. Launch the updated WaterGuru app
2. Ensure that the name of the S3 device appears at the top middle part of the Status screen - Note:  If you have multiple S3 devices, you must repeat the steps for each S3 device 
3. Ensure that you are within Bluetooth range 6-10' of the S3 device
4. Tap the Settings (Gear) icon in the upper right-hand corner
5. Tap Winterization
6. A spinning icon will appear at the bottom of the screen during the winterization process
7. When S3 winterization is complete, the App will return to the Status screen
8. "Pool is winterized" will appear
9. Close the cover of the box

"Winterization - WaterGuru is Unavailable" 

• If you are not redirected to the Status screen and instead the message "Winterization - WaterGuru is unavailable" is displayed, that is an indication that the App was unable to communicate through Bluetooth with your S3 device to complete the winterization process. This can occur if you are too far away from the S3, or the S3 is not charged and connected to your Wi-Fi network.   

1. Ensure that the S3 is charged and connected to your network
2. Move your phone closer to the S3 device 
3. Disable / Enable Bluetooth on your phone
4. Repeat the Winterization step in the app

S3 un-winterization

1. Remove the S3 from the box
2. Insert a new cassette in the cassette holder
3. Launch the WaterGuru app
4. Ensure that the name of the S3 device appears at the top middle part of the Status screen - Note:  If you have multiple S3 devices, you must repeat the steps for each S3 device 
5. Tap the "Pool is winterized" banner at the top of the screen
6. Wake up the device - Expose the solar panel to very bright light or unscrew the USB port and plug in a USB C cable
7. The top LED light will briefly blink a multi-color pattern during the wake-up process

SENSE S2 / SENSE S1

To store the WaterGuru SENSE S2 or SENSE S1 device during the winter season or if not being used, follow these steps:

• Remove the batteries
• Reinstall the batteries when you plan on using the WaterGuru SENSE again in your pool
• Remove and dispose of the cassette - Once the cassette has been exposed to water, the pads will lose their ability to test if dried out and stored for any period of time
• Reinstall a new cassette when you plan on using the WaterGuru SENSE again in your pool
• Ensure that the device is dry and devoid of water
• Store the device indoors in a non-freezing dry place (>50°F)
• Any cassettes still in their foil wrap should also be stored in a non-freezing dry place (>50°F)

Do I need to change anything in the WaterGuru App?

• No.  As soon as the batteries are depleted, the SENSE device will go Offline since it is no longer connected to Wi-Fi.  The WaterGuru app will display "No connection for XXX days". 
• When you re-open the pool again next season, just put the batteries back in.
• The device will re-connect to your Wi-Fi network (Unless you have changed your router, SSID, Network Password, etc.)  
• If you have changed your Wi-Fi network connection, simply tap Settings > Wi-Fi Settings
• Tap on the name of the SSID of your Wi-Fi network and enter the password

Note:  It is advisable to remove the WaterGuru SENSE when the water temperature drops below 50°F. 

If however you do plan on keeping the SENSE in the water at low exterior temperatures, be aware that the SENSE battery strength will deplete much faster than normal due to the cold water temperature in your pool.  You should closely monitor the battery strength to avoid having measurement failures occur due to the low battery strength being insufficient to power the motor.  You should also closely monitor the outside temperature.  If freezing temperatures 32°F or lower are forecast, the SENSE should be removed from the skimmer. 

Leaving the SENSE in freezing temperatures 32°F or lower will damage the device.  Doing so invalidates the warranty.