Privacy Policy
Last updated: November 2026
Free calculators
The values you type into the calculators are processed in your browser and are not stored. We may save your preferred unit system (US or metric) and recent inputs locally on your device using your browser's storage so the tool remembers them next time — this data never leaves your device.
Waitlist and accounts
If you join the Pro waitlist or create an account, we store your email address (and, for accounts, your pool/spa profile and test history) to operate the service, send you product updates, and process payments. We use Supabase for account storage and Resend for email delivery.
Payments
Pro subscriptions are processed by Lemon Squeezy, our merchant of record. We do not store your card details.
Advertising and analytics
We may show ads served by Google AdSense, which uses cookies to personalize ads and may collect data about your visits across sites. We use Cloudflare Web Analytics, which does not use cookies. Visitors in the EEA, UK, and Switzerland are shown a consent banner before any personalized ad loads. California residents may opt out of the sale/sharing of personal information — see the link in our footer.
Your rights
You can request a copy or deletion of your account data at any time by using the contact form on ourHelp page. We respond to all requests within 30 days.
Contact
Questions about this policy? Use the form on our Help page.
ClearWaterCalc — this page is a draft pending owner review.