Terms of Use

Last updated: 23 July 2026

These Terms of Use ("Terms") are an agreement between you and the developer of Rheon ("the app", "we", "us") governing your use of the app. By installing or using Rheon, you agree to these Terms. If you do not agree, do not use the app.

1. What Rheon is

Rheon 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"). All product names, logos, and trademarks belong to their respective owners and are used only to identify compatible hardware.

2. You need a Kamoer account

To control a pump over the internet, the app uses a Kamoer account and Kamoer's cloud service. You can sign in with an account you already have, or create one from within the app. The app can also start a password reset and, if you ask it to, delete your Kamoer account.

Those actions are carried out on Kamoer's service on your behalf: the account is with Kamoer, not with the developer, and creating or deleting it through Rheon has exactly the effect it would have in Kamoer's own app. Deleting your account is irreversible and is Kamoer's to action — the developer cannot restore it or recover anything held under it.

Your use of that account and service is subject to Kamoer's own User Agreement and Privacy Policy. You are responsible for complying with them and for keeping your account credentials secure.

3. Purchases

Rheon is free to download, and controlling your pump — in both Cloud and Bluetooth mode — is free to use. Some additional features, currently volume alerts and device backups, are unlocked by a single one-off in-app purchase. There is no subscription and no recurring charge.

Purchases are sold and processed by Apple through the App Store, not by the developer. The developer never receives or handles your payment details. Your purchase is tied to your Apple Account and can be restored on your devices with Restore Purchases in the app.

Refunds are handled by Apple under the App Store's terms rather than by the developer; request one at reportaproblem.apple.com. This does not affect your statutory rights as a consumer in respect of digital content — including your rights where it is faulty, not as described, or not of satisfactory quality — which apply to the paid features and cannot be excluded by these Terms.

We may change which features require the purchase, and its price, for future purchases. Anything you have already unlocked stays unlocked.

4. Acceptable use

• Use the app only with hardware you own or are authorised to control.
• Do not use the app for any unlawful purpose, or to interfere with or disrupt Kamoer's services or other users.
• Do not attempt to misuse, attack, or overload any service the app connects to.

5. The app controls real hardware — use it carefully

Rheon actuates a physical dosing pump that moves liquids into a living system. Incorrect doses, calibration errors, connectivity problems, or software bugs can harm aquatic life or equipment. You are solely responsible for how you configure and operate your pump. Test changes with small volumes into a measuring container before dosing into an aquarium, and do not rely on the app for anything safety-critical.

6. No warranty

The app is provided "as is" and "as available", without warranties or representations of any kind except those that cannot be excluded under the law of England and Wales. We do not warrant that the app will be uninterrupted, error-free, secure, or compatible with any particular device, firmware, or version of Kamoer's service, which may change at any time outside our control.

Nothing in these Terms affects your statutory rights as a consumer that cannot be excluded or limited by law.

7. Limitation of liability

Nothing in these Terms limits or excludes the developer's liability for death or personal injury caused by negligence, for fraud or fraudulent misrepresentation, or for any other liability that cannot be limited or excluded under the law of England and Wales.

Subject to the paragraph above, and to the maximum extent permitted by law, the developer will not be liable for any loss of livestock, plants, data, profits, or equipment, or for any loss or damage that was not reasonably foreseeable, arising out of or related to your use of, or inability to use, the app. The app is supplied for domestic and private use only; if you use it for any commercial purpose the developer will have no liability to you for any business loss.

Subject to the paragraphs above, the developer's total liability to you for all other claims relating to the app is limited to the total amount you have paid for the app and any in-app purchase in the 12 months before the claim. This does not affect your statutory rights as a consumer that cannot be excluded or limited by law.

8. Changes and availability

We may update, change, or discontinue the app or these Terms at any time. If these Terms change, the updated version will be posted on this page with a new "Last updated" date. Continued use of the app after changes take effect means you accept the updated Terms.

9. Governing law

These Terms are governed by the laws of England and Wales. The courts of England and Wales have exclusive jurisdiction over any dispute arising out of or relating to these Terms or your use of the app, except that if you are a consumer resident elsewhere in the United Kingdom you may also bring proceedings in the courts of the part of the UK where you live. Nothing in these Terms affects your statutory rights as a consumer that cannot be excluded or limited by law.

10. Contact

Questions about these Terms? Contact [email protected].