Pool Calculators & Tools
Free chemistry calculators based on TFP/SLAM methodology. No signup required.
All-in-One Pool Calculator
Chlorine, pH, alkalinity, calcium and salt dosing for your pool — all on one screen.
Quick Water Test
Fast entry for all readings with instant dosing recommendations and LSI calculation.
Chlorine / SLAM Calculator
Calculate chlorine dosing based on your CYA level. Includes SLAM targets.
pH Calculator
Calculate muriatic acid or soda ash needed to adjust your pool pH.
Alkalinity Calculator
Calculate baking soda dosing to raise Total Alkalinity and stabilize pH.
CYA / Stabilizer Calculator
Calculate cyanuric acid dosing to protect chlorine from UV degradation.
Calcium Hardness Calculator
Calculate calcium chloride needed to raise CH and prevent damage.
Salt Calculator
Calculate how much salt to add for your salt water pool SWG system.
Borates Calculator
Calculate boric acid or borax dosing for pools and hot tubs (target 30-50 ppm).
Pool Volume Calculator
Calculate your pool's volume in gallons from dimensions. All shapes.
Pump Runtime & Energy Calculator
Estimate pump turnover time, daily runtime and energy cost — compare single vs variable-speed.
Pool Heater & Spa Calculators
Estimate pool heater warm-up time and how often to change spa water.
All-in-One Pool Checklist
Interactive daily, weekly, monthly and seasonal pool care checklist — check off, customize to your equipment, save and print.
SLAM Process Checklist
Step-by-step SLAM: raise chlorine, daily testing, OCLT, and completion criteria.
Weekly Maintenance
Routine testing, chemical adjustments, skimming, filter checks, and equipment inspection.
Pool Opening
Spring startup: remove cover, clean, reconnect equipment, balance water chemistry.
Winterizing
Winterize your pool: lower water, blow out lines, add winter chemicals, cover.
Ideal Pool Chemistry Ranges
Keep your pool water balanced within these recommended ranges:
| Parameter | Ideal Range | Notes |
|---|---|---|
| Free Chlorine (FC) | Based on CYA | Min FC = CYA ÷ 20 (rounded up) |
| pH | 7.4 - 7.6 | Affects chlorine effectiveness and comfort |
| Total Alkalinity (TA) | 60-80 (SWG) / 80-120 ppm | Buffers pH; SWG pools run lower |
| Cyanuric Acid (CYA) | 30-50 / 70-80 ppm (SWG) | Protects chlorine from sunlight |
| Calcium Hardness (CH) | 250-400 (plaster) / 150-250 (vinyl) | Prevents etching and liner damage |
| Salt (SWG only) | 3000-3500 ppm | Check your SWG manufacturer specs |
What is TFP/SLAM?
TFP (Trouble Free Pool) is a methodology for maintaining crystal clear pool water using the FC/CYA relationship chart instead of arbitrary "shock" levels. It emphasizes testing and adjusting based on actual water chemistry.
SLAM (Shock Level And Maintain) is the TFP process for clearing algae or cloudy water. Raise chlorine to "shock level" based on your CYA, then maintain it 24/7 until you pass three tests: clear water, zero CC, and overnight FC loss under 1 ppm.
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