Care schedule
Know what is due next.
Turn water testing, cleaning, filter care, and equipment checks into a repeatable pool- or spa-specific routine.
Open my schedule →Independent water-care planning
Know what your water needs—and why.
Turn measurements and product-label facts into conservative, transparent pool and hot-tub maintenance plans. No account. No brand agenda. Your data stays on your device.
✓ Exact-decimal calculations ✓ Source-dated guidance ✓ Label-first dosing
Troubleshooting
Start with the symptom.
Work through safety, circulation, fresh testing, and treatment in the right order when something looks wrong.
Find the problem →Seasonal guides
Handle the bigger jobs with a checklist.
Opening, closing, freeze preparation, filters, salt cells, vacations, and spa refills.
Browse care guides →Calculators
Start with what you can measure
01New
Daily care
Water test dashboard
Record a full test, see priorities, follow treatment progress, and compare recent results.
Open calculator →02Start here
Volume
Pool volume
Rectangle, circle, oval, kidney, variable-depth and metric calculations.
Open calculator →03
Volume
Hot-tub volume
Compare shell geometry with measured hose-flow fill volume.
Open calculator →04Staged dosing
Chemistry
Liquid chlorine dose
Exact active-mass planning from label strength and product density.
Open calculator →05Spa-first
Spa care
Spa sanitizer & water age
Scale bromine or dichlor label directions, track water age, and follow a drain-and-refill sequence.
Open calculator →06Label based
Water balance
pH label-dose planner
Scale your product label's own pH dose conservatively without pretending pH response is linear chemistry.
Open calculator →07
Chemistry
Salt addition
Use your salt-system manual’s target and the package purity.
Open calculator →08
Chemistry
Cyanuric acid
Pool-only stabilizer planning with an explicit hot-tub prohibition.
Open calculator →09
Water exchange
Water replacement
Mass-balance dilution with non-zero refill-water concentration.
Open calculator →010New
Water balance
Total alkalinity
Plan sodium-bicarbonate additions from product purity and tested alkalinity.
Open calculator →011New
Water balance
Calcium hardness
Account for calcium-chloride form and purity before planning an increase.
Open calculator →012New
Water balance
LSI water balance
PHTA-style saturation-index calculation with CYA-corrected alkalinity and revised TDS factors.
Open calculator →Built around your pool or spa
Save the facts that affect every decision.
Keep multiple pool and spa profiles with volume confidence, surface, sanitizer, CYA use, and a named source profile—without creating an account.
Manage my pools & spas →Safety center
Know when calculation should stop.
Cloudy water, chemical mixing, unsafe temperatures, broken drain covers, electrical work, and structural draining risk all require a different response.
Read stop-use guidance →