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Unified Observations
4/11/2026
We have just rolled out a refinement to the Feed Log system. This update provides a more observation-based model for reservoir management.
Status Check-ins vs. Feeding Events
To support this new model, we've introduced dedicated shortcuts:
- Log Status: For quick environment monitoring (pH, EC, Temp). This keeps your log clean by hiding additives columns for that row.
- Log Feed: For when you are actually adding water or substances.
Introducing the Smart Top-Off Calculator
This tool is designed to move your reservoir toward a target mixture using simple ratio logic. It automatically detects your last recorded state and warns you if your planned additions exceed your reservoir's historical maximum volume or if the target is unreachable.
These updates represent a significant shift in how data is stored in the background. While the migration is seamless, these features are considered Active Testing. Please report any issues via Feedback.
Minor UX Updates
3/20/2026
Today's update brings a few minor refinements to our user interface, particularly for folks exploring without an account.
UI Polish
- Improved Login / Logout handling with the new anonymous access system
- Minor animation flourishes
- Improved handling of anonymous permissions throughout the app
- Improved backend security checks
As always, feedback is welcome!
Further Anonymous Improvements
3/18/2026
Some new features and a little under-the-hood improvements.
Shared Mixtures & the Editor
We want to make it as easy as possible to learn from the community. Anonymous users can now open shared mixtures directly in the Mixture Editor.
This allows you to take a formula shared by a registered user, experiment with different nutrient concentrations, and see how varying water quality affects the results—all before you even create an account. It's the perfect way to test-drive the power of our optimization engine with real-world examples.
Icon Performance Improvements
Behind the scenes, we've completed a migration of our icon system. We've moved to a streamlined SVG path system.
This should further improve the site speed as well as better handle multiple dimensions and resolutions.
We Value Your Feedback
If you encounter any bug, or just want to suggest an improvement, please use the Feedback form within the app.
We're building Hydro-Calc for you, and your feedback directly shapes our development roadmap.
Try it out now and let us know what you think!
Anonymous Usage
3/15/2026
You no longer need an account to use Hydro-Calc.
Just open the app and start working. No sign-up, no email, no password.
What You Get
- Global Substance Library — Browse and use our full database of hydroponic chemicals.
- Temporary Shelf — Add substances to your session shelf for calculations.
- Mixture Builder — Create formulas and run calculations against your nutrient targets.
- Water Quality — Factor in source water analysis as normal.
One Limitation: 24-Hour Expiry
Anonymous data is temporary. Everything you create is automatically deleted after 24 hours.
WARNING
Save your work by creating an account before your session expires.
Upgrading is Instant
Register or sign in with Google while in an anonymous session and your data carries over automatically — mixtures, shelf items, everything. No re-entry required.
Open the app and start formulating.
Password Change
3/9/2026
We're continuously working to improve the Hydro-Calc experience. Today's update brings a much-requested security and account management feature.
Password Management
You can now change your login password directly from the Settings page within the application.
As always, if you registered via Google, your authentication remains managed directly by Google.