PoolFu - Pool & Spa Chemistry
Chemical Dosing Calculator
Free · In‑App Purchases
Pool chemistry calculated for your water. Exact doses matched to your equipment, surface, and conditions. Ask Splash about your water and get answers based on your pool.
PoolFu is a complete pool and spa care system that tells you exactly what and how much to add, and when your water is safe to use. It goes beyond a simple pool chemical calculator by checking how your readings, equipment, surface, weather, and history affect each other before giving clear recommendations for safe, clean, crystal-clear water.
You can go as deep as you like, or just follow the recommendations. Basic pool calculators treat each reading in isolation. PoolFu considers how everything works together with as a unified system. A saltwater generator can push pH upward. Total alkalinity affects pH stability. CYA changes the meaning of your chlorine level. Temperature changes how heated pools and spas behave.
Note: PoolFu requires a subscription to use. Every new account includes a 14-day free trial, and you can cancel anytime during the trial. No trial is available for Pro subscriptions.
PoolFu works offline when you need it, and keeps your pools, spas, tests, and history synced across devices.
SAFER WATER GUIDANCE
PoolFu tells you whether your pool or spa is safe to use, needs caution, or should stay closed for now. If sanitizer is too low, a chemical combination is risky, or a recovery plan needs time to work, PoolFu explains the reason before anyone gets in the water.
SMARTER DOSING
Every recommendation tells you what to add, how much to add, and why. PoolFu coordinates chlorine, pH, alkalinity, calcium, stabilizer, salt, temperature, surface, equipment, and recent test history, so one correction does not create another problem.
ASK SPLASH
Ask Splash questions like: Why is my pool cloudy? What does CYA do? Is it safe to swim right now? Splash uses your pool or spa profile, recent readings, equipment, and history to answer in plain language.
HEALTH SCORE
See one clear score from 0 to 100 showing where your water stands. PoolFu weighs the full chemistry picture, tracks trends, and uses water balance analysis to flag corrosive or scale-forming conditions.
HOT TUBS AND SPAS
PoolFu supports spa-specific chemistry, bromine guidance, drain-and-refill flows, and over 1,700 hot tub models from 160+ brands. Your spa model helps PoolFu give more specific water-care guidance instead of generic hot tub advice.
SALTWATER POOLS
PoolFu includes specs for 616 saltwater generator models from 129 manufacturers, with model-specific salt targets, output guidance, pH drift handling, and sanitizer behavior.
WEATHER-AWARE
Real-time conditions, freeze warnings, and rain correlation help PoolFu understand why your water changed. If salt drops after a storm, PoolFu connects the dots.
TRUST
No ads. No chemical company sponsors. PoolFu recommends what your water actually needs, based on real chemistry, not what a brand wants to sell you.
MULTI-LINGUAL
PoolFu supports English, Spanish, Portuguese, German, Italian, French, Chinese (Simplified and Traditional), and Japanese.
FOR POOL SERVICE PROFESSIONALS
PoolFu Pro is also available as a separate monthly subscription for pool service businesses. Manage customers, pools, spas, visits, photos, videos, service notes, recurring schedules, branded PDF reports, and chemical inventory from one place.
Start a visit, test water, apply treatments, log geotagged media, and check out with a workflow that helps prevent data from being saved to the wrong pool. Track truck inventory and personal chemical products from 2,721 chemicals across 180+ brands, so PoolFu can reference your actual products in every dosing calculation.
Master your water.
Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Payment is charged to your Apple ID account at confirmation of purchase. Manage or cancel anytime in Apple ID settings.
Terms of Use (EULA): https://poolfu.app/terms/
Privacy Policy: https://poolfu.app/privacy/
What's new in PoolFu
Supplemental sanitizer support for spas
- New Supplemental Sanitizer setting for spas with a UV, active oxygen (AOP), or nanobubble system
- Chlorine guidance adjusts to the lower level these systems run: a 3 ppm target, with 2 to 3 ppm counting as acceptable between soaks
- Bromine spas adjust from 5 ppm to 4 ppm
- Safety limits are unchanged: below 2 ppm chlorine is still critical, and bromine keeps its 4 ppm minimum before anyone gets in
Spa chlorine dosing
- Spas now dose to a 4 ppm target, the middle of the 3 to 5 ppm ideal range
- Dose amounts for chlorine spas change slightly
Export from the calendar
- Added Export Data to the history calendar for your own pool and spa
- Exports test readings and treatments as CSV spreadsheets, or a full PoolFu backup
Product filtering
- Products now filter by category, brand or common chemical, and region from a single Filters button
- Active filters show as tags you can tap to remove
- Search now respects your filters, and finds products sold in other regions
- Common chemicals expanded to 26 entries, including calcium hypochlorite shock and liquid chlorine
- Added 172 Lawrason's products including Aqua, for Canada
Retest reminders
- Pools now wait 4 hours after adjusting pH with acid, and until the next morning after a shock
- Hot tubs keep their faster 1 hour and 6 hour reminders
- Spas with a supplemental sanitizer are reminded to test every 3 days
Pro data after cancellation
- Pro features stop when a Pro subscription ends, but nothing you built with Pro is deleted
- Added a Your Pro Data screen showing what is stored, with a backup or spreadsheet of each customer, and a button to resubscribe and pick up where you left off
Other improvements
- Added haptic feedback when you save a test, log a treatment, unlock an achievement, or finish a service visit
- Added a Done button to the keyboard on the Test Water screen
- Cleaned up the Settings screen
- Shared reading and achievement cards render at higher resolution
The developer, CyberHost LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Location
- Contact Info
- User Content
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Contact Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Cyberhost LLC
- Size
- 105.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
English and 8 more
- English, French, German, Italian, Japanese, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Monthly $5.99
- Annual $53.99
- Pro Monthly $29.99
- Pro Annual $269.99
- Copyright
- © 2026 Cyberhost LLC

