Built for commercial pools.
Pool Chemical Logbook is the professional logbook & calculator for hotels, HOAs, apartments, health clubs, and facilities—and it works great for homes, too. Record daily chemistry, see LSI instantly, compute exact product-based doses, and export inspector-ready monthly PDF logbooks. The app runs offline on-site and syncs to the cloud when you’re back online.

Why operators choose it:

- Code-friendly monthly logbook: Clear, inspector-ready PDF reports many cities expect you to keep on file.

- Offline-first: Keep logging and editing with no internet; your data syncs automatically when service returns.

- Commercial focus: Multiple pools/spas per property, fast entry, initials/notes, and correction workflows.

- Exact dosing, fewer callbacks: Product-aware math shows side-effects (e.g., dichlor adds CYA, cal-hypo adds CH) so you don’t over-correct.

What you can do:

1- Log pools & spas fast
pH, Free/Combined Chlorine (FC/CC), Total Alkalinity (TA), Calcium Hardness (CH), Stabilizer/CYA, TDS, Temperature, Flow, and Filter PSI.

2- See LSI live
Color-coded Langelier Saturation Index with a pointer—spot corrosive/balanced/scale-forming water at a glance.

3- Calculate precise chemical doses

- Raise FC: Liquid chlorine 12.5%, Cal-Hypo 67%, Dichlor 56%, Trichlor 90%

- Lower/neutralize FC: Sodium thiosulfate, Sodium sulfite

- Raise TA: Sodium bicarbonate, Soda ash, Sodium sesquicarbonate

- Lower TA / pH: Muriatic acid 31.45%, Sodium bisulfate

- Raise CH: Calcium chloride 100% / 77%

- Raise CYA: Cyanuric acid
Each option shows realistic side-effects and scales to your volume (US or metric).

4- Export inspector-ready monthly PDFs
One tap to generate professional summaries for audits, city/health reviews, or management reports.

5- Targets & guided corrections
Set your desired ranges and get step-by-step help to bring water back into balance.

6- Units your team expects
Gallons/Liters, °F/°C, and smart dose units (fl oz / gal / oz / lb or mL / L / g / kg).

Offline + cloud = reliable operations:

- Works anywhere: Logging, editing, and reviewing continue without internet.

- Automatic sync: When the device is online, the app syncs changes to your account for backup and device upgrades.

- Inspector-ready always: Your monthly logbooks are available on device and as PDFs you can email or archive.

Designed for:

- Commercial operators: Hotels, HOAs, apartments, community centers, fitness clubs, schools, and service companies.

- Residential owners: Anyone who wants simple steps, accurate dosing, and neat records.

Free vs Pro:

- Free: Quick logging, LSI gauge, targets, multiple pools/spas.

- Pro (subscription): Advanced chemical calculator & corrections, pH–TA coupled guidance, and PDF export.

Notes & safety:

Calculations use typical concentrations and industry formulas; always follow product labels, add chemicals with circulation running, brush after additions, and retest. Local regulations vary—use the app to support, not replace, your professional judgment and your jurisdiction’s code.