Privacy notice

Who we are

The app is run by Deep Blue Pool Supplies, which is the "controller" of your personal information. If you have any questions about your data or this notice, email us at sales@deepbluepoolsupplies.co.uk.

What we collect and why

• Your email address - if you create an account, so we can send you a sign-in link and (if you choose) test reminders and seasonal care emails.
• Pool details and test results - if you save them: for example the name, size and type of your pool or hot tub, your readings and the checklist steps you tick. We use these to show your history and trends and to work out treatment doses.
• Postcode area (optional) - just the first part, such as "BH21". It is only ever used in aggregate, for example to see how water hardness varies around the UK. We never use it to identify or contact you.
• Anonymous usage analytics - such as "an analysis was completed" or "a help article was viewed", with a random ID stored on your device. This helps us improve the app. It does not include your name or email.
• Push notification subscription - if you turn on reminders on your phone, your browser gives us a technical address to send them to. Turning notifications off removes it.

Your photos stay on your phone

When you photograph a test strip, the picture is analysed on your own device, in your browser. The photo is not uploaded to us or anyone else.

If you correct a reading and tick "help improve accuracy", we receive only the pad colours and the values involved - never the photo itself - to make readings more accurate for everyone. This is entirely optional.

Our lawful bases

• Contract - to provide your account and the features you ask for, such as saving tests, history and reminders.
• Consent - for push notifications, marketing emails and sharing corrected readings. You can withdraw consent at any time in the app or by contacting us.
• Legitimate interests - for anonymous analytics, aggregated statistics, keeping the app secure and fixing errors. These have minimal impact on your privacy.

How long we keep it

• Your account, pools and test results are kept until you delete your account.
• Anonymous usage statistics are kept for 24 months, then deleted.
• Error reports are kept for a short period (typically 90 days) to fix problems.

Who processes data for us

We use a small number of trusted service providers ("processors") who act only on our instructions and under a written agreement:

• Supabase - database and sign-in. Data is hosted in the EU.
• Vercel - hosts the app and provides cookie-free, anonymous visitor analytics.
• Resend - sends sign-in and reminder emails.
• Sentry - error monitoring, so we can fix bugs.

Where a provider handles data outside the UK, it is protected by UK adequacy regulations or the International Data Transfer Agreement / UK Addendum to the EU standard contractual clauses. We never sell your data.

Cookies

If you sign in, we set a single session cookie to keep you signed in. It is strictly necessary, so no consent banner is needed. We do not use advertising or tracking cookies. Vercel Analytics is cookie-free. The app also stores some settings on your device (such as checklist ticks and a random analytics ID) in your browser's local storage; you can clear this at any time in your browser settings.

Links to our shop include tags showing they came from the app, so we can see which advice helps. The shop at www.deepbluepoolsupplies.co.uk has its own privacy and cookie policy.

Your rights

You have the right to:

• ask for a copy of the information we hold about you;
• ask us to correct anything that is wrong;
• ask us to delete your information;
• object to, or ask us to restrict, how we use it;
• receive your data in a portable format;
• withdraw consent at any time, where we rely on consent.

To contact us about any of these, email sales@deepbluepoolsupplies.co.uk. We will reply within one month.

Deleting your account

You can delete your account at any time: go to Account and choose Delete account. This permanently removes your account, pools, test results, checklists, share links and notification subscriptions. Anonymous statistics that cannot be linked back to you are not affected. Alternatively, email sales@deepbluepoolsupplies.co.uk and we will do it for you.

Complaints

If you are unhappy with how we have handled your information, please contact us first so we can try to put it right. You also have the right to complain to the Information Commissioner's Office (ICO) at ico.org.uk or on 0303 123 1113.

Changes to this notice

If we make important changes we will update the date at the top of this page and, where appropriate, let account holders know by email.