Privacy Policy

Last updated: 14 July 2026

Rheon ("the app", "we", "us") is an independent, unofficial controller for the D-D H2Ocean P1+ dosing pump (also sold under the Kamoer brand). It is not affiliated with, endorsed by, or operated by D-D The Aquarium Solution or Kamoer Fluid Technology ("Kamoer"). This policy explains how the app handles information. It applies to the Rheon app on iOS and iPadOS.

1. No accounts, analytics, advertising, or tracking

Rheon has no user accounts or general-purpose backend, and it does not automatically send the developer your information, usage data, diagnostics, or location. There is no analytics, advertising, attribution, tracking, or crash-reporting software in the app. The only developer-operated network service is the optional feedback relay described in section 6.

2. Information stored on your device

To work, the app stores the following locally on your device. Sensitive items are kept in the system Keychain. None of it is transmitted to the developer.

• Kamoer sign-in session — the authentication token returned when you log in with your Kamoer account (Keychain).
• Remembered logins — the email address or phone number you choose to have the app remember (Keychain).
• Device credentials — secrets used to receive live updates from your pump, such as MQTT credentials and per-device secrets (Keychain).
• App data — your settings, volume-alert configuration, and a cache of recent device state, stored in the app's local storage.

You can remove this at any time using Settings → Clear App Data in the app, or by deleting the app, which also removes its Keychain items.

3. Information sent to Kamoer's cloud (Cloud mode)

The pump's standard, internet-based control runs through Kamoer's cloud service. When you use the app in Cloud mode, it signs in with your Kamoer account and sends commands to, and reads status from, that service over an encrypted connection. This typically involves your Kamoer account identifier, authentication tokens, your pump's identifiers, and the dosing commands and device state you view or change.

Kamoer Fluid Technology operates this cloud service (on Alibaba Cloud / Aliyun infrastructure) and is the party that collects and processes that information. Their handling of it is governed by Kamoer's own documents, not by this policy:

• Kamoer Privacy Policy
• Kamoer User Agreement

Kamoer's cloud runs on Alibaba Cloud (Aliyun) infrastructure, so using Cloud mode means your data is processed by Kamoer outside the United Kingdom and the EEA, in China. That transfer is made by you and Kamoer under Kamoer's own policies; the developer is not the controller of that data and does not carry out the transfer.

Rheon is an independent client for that service and has no control over, and takes no responsibility for, Kamoer's data practices.

4. Bluetooth mode is local

When you use the app's Bluetooth mode, it connects directly to a nearby pump over Bluetooth Low Energy. In this mode no internet connection is used, nothing is sent to Kamoer's cloud or anywhere else, and no data leaves your device and pump.

5. Notifications

If you enable volume alerts, the app schedules local notifications on your device to warn you about low or depleted dosing containers. These are generated and delivered on-device and are not sent through any server.

6. Optional feedback

Rheon includes a Send Feedback form. Nothing is sent unless you choose to submit that form. A submission contains the subject and message you enter. It may also contain a screenshot and diagnostic logs, but only when you explicitly choose to attach them. Review the form and remove anything you do not want to share before sending. Do not include passwords, authentication codes, or account tokens.

The submission is sent over an encrypted connection to a Cloudflare Worker operated for Rheon. Cloudflare Email relays it to the developer at [email protected]. The information is used only to respond to your request, investigate problems, and improve the app. Feedback messages and attachments are deleted within 90 days. They are not used for advertising or tracking and are not sold.

If you want a feedback submission deleted sooner, contact [email protected] from the same email address or provide enough information to identify the submission.

7. Third-party components

The app includes the open-source library PhoneNumberKit to format and validate phone numbers for login. It runs entirely on your device and makes no network connections. The app contains no advertising, analytics, or tracking SDKs.

8. Children

Rheon is a tool for aquarium hardware and is not directed at children, and we do not knowingly collect information from anyone, including children.

9. Your choices

• Erase the app's local and Keychain data via Settings → Clear App Data, or by uninstalling the app.
• Manage or delete your Kamoer account, and the data Kamoer holds, through Kamoer's own services and policies.
• Choose whether to submit feedback and whether to attach a screenshot or diagnostic logs.

10. Your data protection rights

Apart from feedback you voluntarily submit, the developer holds no data about you. The app's local data can be erased via Settings → Clear App Data or by deleting the app (see section 2). To ask about or request deletion of submitted feedback, contact [email protected].

For any personal data held by Kamoer's cloud, Kamoer is the controller, so UK and EU data-protection rights — such as access, correction, deletion, portability, and objection — are exercised through Kamoer under its own policies. If you are in the UK or EU and have a concern, you may also complain to your data-protection authority; in the UK this is the Information Commissioner's Office (ICO).

11. Changes to this policy

If this policy changes, the updated version will be posted on this page with a new "Last updated" date.

12. Contact

Questions about this policy? Contact [email protected].