Aquavail

Aquavail is a water chemistry app that gives you personalized dosing recommendations for your hot tub, pool, swim spa, or cold plunge. Enter your test strip readings, report what you see and smell, and get step-by-step guidance tailored to your exact setup.

Hot tubs, pools, swim spas, and cold plunges. Ideal ranges for chlorine, bromine, calcium hardness, salt, and CYA adjust automatically for each type, and a pool can be set as indoors, out of the sun, so no stabilizer is added. Drain schedules, temperature ranges, and chemistry targets are specific to each type.

Once a spa or pool has two tests, Water Trends charts pH, its sanitizer (chlorine or bromine), and alkalinity across the last ten tests, with each reading’s ideal range shaded behind its line. The chart is free for everyone. With Pro and AI on, a written reading below it covers what moved, what keeps coming back, and what to change. Open it from the dashboard, or from Trends beside a spa’s Recent Tests.

Yes. By default Aquavail follows your region: metric regions see liters, Celsius, and grams (milliliters or liters for liquid chlorine), and the US sees gallons, Fahrenheit, and spoons, cups, or pounds. Pick Metric, US, or Automatic any time in Settings; your readings and setup carry over when you switch. Test readings stay in ppm either way.

Yes. To fix a reading, tap the pencil on a test’s results, or long-press the test under Recent Tests and choose Edit Test; the advice updates to match. With Pro, Export History in the menu on a spa’s details screen shares all of its tests as a spreadsheet (CSV) with the date, status, every reading, the water condition, and the advice.

Chlorine, bromine, salt systems, mineral cartridges (e.g., FROG), ozone, and UV+ozone. Each gets the right products, dosing amounts, shock type, and ideal ranges. Chlorine pools top up and shock with liquid chlorine and aim for 2–4 ppm; bromine hot tubs aim for 4–6 ppm.

Enter readings for pH, free chlorine, total chlorine, bromine, alkalinity, calcium hardness, cyanuric acid, salt, and phosphate — filtered by your sanitizer type. You also report water condition: clarity, foam, smell, color, and deposits.

Yes. Turn the iPad sideways and your spas and pools appear in the My Spas & Pools sidebar beside the dashboard, each showing its latest water status. Tap one to switch the dashboard to it, add another with Pro without leaving the list, or open a spa’s details and recent tests from the info button on its card. The Add Spa or Pool button and a care tip stay pinned below the list as it scrolls. On iPad and the unfolded iPhone Duo, Settings stays at a readable width instead of stretching across the screen. Portrait and the iPhone layout are unchanged.

Yes. Ask Siri “Is my water balanced in Aquavail?” and it tells you whether the water is balanced, what’s out of range, when you last tested, and when your next drain is due, without opening the app. Ask “When do I drain my hot tub in Aquavail?” for the next drain date, or log a drain and refill by voice to reset your maintenance timeline. All three work through Siri, Spotlight, and the Shortcuts app. Siri learns your spa and pool names, so “Check Backyard Spa in Aquavail” works too, and if you have more than one and don’t name it, Siri asks which.

Enter your test strip readings and water condition. The moment you save, even offline, Aquavail shows exact chemical amounts scaled to your water volume, in metric or US units, in chemistry order with explicit wait timing between chemicals so you know when to add the next one. With AI on, it then refines that advice using your recent tests. Your first three AI readings are free; Pro gets AI on every test.

When multiple chemicals need to be added, Aquavail puts them in the correct order — alkalinity before pH, salt before chlorine — and tells you exactly how long to wait between each one. No more guessing whether the previous chemical has finished circulating or whether you can add the next product yet.

Balanced means all readings are in range and water looks good. Fair means one reading is slightly out of range or the water shows a minor issue. Adjust means a reading is clearly off, two are slightly off, or the water has a moderate issue. Urgent means a dangerous reading, three or more readings clearly off, or a severe water condition.

Aquavail estimates your drain schedule based on tub type, water volume, and usage frequency. When it's time, you get pre-drain prep tips tailored to your tub type plus approximate First-Fill Chemistry that adjusts for your fill water source — city, well, softened, or reverse osmosis each get different baseline assumptions. Tap “I’ve Drained & Refilled” after a drain to reset the schedule and save your fresh baseline.

After a drain and refill, Aquavail calculates approximate startup dosing for your fresh water. The recommendations adjust for your fill source — city water uses typical baselines, well water often skips alkalinity and hardness (often already high), softened and RO water need more of both, and unknown sources prompt you to test before adding anything. Each source also gets a tailored caveat — for example, well water users get metal-sequestrant guidance.

Yes, with Pro. The free version tracks one hot tub, pool, swim spa, or cold plunge, and Pro adds as many as you own. Anything you already set up always stays. Switch between them from the dashboard, or the sidebar on iPad.

The free version includes full rule-based dosing for every water body and sanitizer type, one spa or pool, the Water Trends chart, and three AI readings. Pro is a one-time $14.99 purchase — no subscription, no recurring charges. Includes Family Sharing.

Pro adds AI on every test, a written reading of your trends, every spa and pool you own, and history export as a spreadsheet. Your first three AI readings are free. AI is optional for everyone: turn it off in Settings any time. Everything else, including dosing calculations, water status, the Water Trends chart, test editing, drain tracking, phosphate testing, First-Fill Chemistry, metric units, and Siri, is free.

Standard recommendations follow fixed dosing formulas based on your current readings. AI recommendations start from that same advice and add context: up to four earlier tests and the advice they got, water condition patterns, and how the water is used. Every amount still comes from Aquavail’s chemistry rules, and the app checks each AI reply: if an amount was changed or added, you see the standard advice instead. The AI may suggest a retest or preventive steps and, when your tests or the water call for it, a shock sized by the same rules.

Long-press any AI-written recommendation or trend reading and choose Report, then pick a reason: offensive or harmful, inaccurate, or something else. Aquavail opens an email to its support team in your default email app with the reason, the AI text, and the app version. Nothing is sent until you send it.

No signup, no email, no password. Start testing immediately after adding your first spa or pool.

Your spas, pools, and test history stay on your device — no cloud sync, no signup, no password. At launch the app opens an anonymous session with our backend, used only to authenticate and rate-limit AI requests; it carries no name, email, or location. When AI writes a recommendation (with Pro, or one of your three free readings), it gets this test’s readings and water condition, up to four earlier tests with the advice they got, and your spa or pool’s setup: type, volume, sanitizer, temperature, weekly use, fill water, whether people shower first, whether a pool is indoors, and drain timing. A Pro trend reading sends the last ten tests the same way. All of it goes through that secure proxy to SpaceXSI for processing, never your spa’s name or any personal information. AI is optional and can be turned off in Settings. History exports and AI reports leave the device only when you share or send them.

Yes. Enter tests, view recommendations, and track drain schedules without an internet connection. Advice appears the moment you save a test, even offline; once you’re back online, tap Try Again under it for the AI version. A failed AI attempt never uses up a free reading. Buying or restoring Pro needs a connection.