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Pool Chemical Calculator – Water Balance Care

Comprehensive swimming pool water care dashboard. Enter your test strip or drop test kit readings to evaluate water balance and get safe, prioritized adjustment guidance.

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Current Test Kit ReadingsEnter test strip or DPD liquid reagent results
Ideal: 2.0 – 4.0 ppm
Ideal: 7.4 – 7.6
Ideal: 80 – 120 ppm
Ideal: 30 – 50 ppm
Ideal: 200 – 400 ppm
Ideal: 2,800 – 3,400 ppm

Water Balance Status

Free ChlorineTarget: 2.0 – 4.0 ppm
Low
1.5ppm
▲ Raise: 10% Liquid Chlorine

Add 30.3 fl oz (0.9 L)

Raises Free Chlorine to safe sanitizing level without adding stabilizer.

Open Chlorine Calculator
Total AlkalinityTarget: 80 – 120 ppm
Low
60ppm
▲ Raise: Sodium Bicarbonate (Baking Soda)

Add 10.1 lb (4.58 kg)

Stabilizes water against rapid pH bounce.

Open Baking Soda Calculator
pHTarget: 7.4 – 7.6
High
7.8
▼ Lower: 31.45% Muriatic Acid

Add 13.5 fl oz (0.4 L)

Lower pH to protect sanitizer efficacy and prevent scaling.

Open Muriatic Acid Calculator
CYA / StabilizerTarget: 30 – 50 ppm
In Range
40ppm
Calcium HardnessTarget: 200 – 400 ppm
In Range
280ppm
SalinityTarget: 2,800 – 3,400 ppm
Low
2400ppm
▲ Raise: High-Purity Pool Salt

Add 120.2 lb (4 × 40 lb bags)

Needed for Saltwater Chlorine Generator to operate without low-salt error.

Open Salt Calculator

Recommended Adjustment Sequence

Do not add multiple chemicals simultaneously. Chemical adjustments should be executed in this order:

  1. 1Step 1: Balance Total Alkalinity first. Bicarbonate buffers the water, making subsequent pH control predictable.
  2. 2Step 2: Adjust pH with muriatic acid slowly into the deep end with the pump circulating.
  3. 3Step 3: Add Free Chlorine sanitizer after TA and pH are stabilized.
Pool Chemical Safety Guidelines

Pool chemical calculations are estimates. Verify your pool volume and test results, follow the product label, add chemicals separately, circulate the water as directed, and retest before making further adjustments.

Never mix chlorine products with acids or other pool chemicals. Mixing can release lethal toxic chlorine gas.

The 5 Pillars of Healthy Pool Water

1. Free Chlorine (Sanitization)

Chlorine kills harmful pathogens, viruses, and algae. Keep Free Chlorine within 2.0 to 4.0 ppm. Never let it drop to 0 ppm even for a few hours in warm weather.

2. pH (Bather Comfort & Equipment Longevity)

Human tears have a pH of approximately 7.4. Keeping pool water between 7.4 and 7.6 prevents eye irritation while preventing scale formation and metallic corrosion.

3. Total Alkalinity (The pH Buffer)

Alkalinity buffers against sudden acid or base shocks. Adjust alkalinity first with sodium bicarbonate before making fine adjustments to pH.

4. Calcium Hardness (Plaster Protection)

Water with insufficient calcium is "hungry" and will dissolve calcium directly out of pool plaster, pebble finishes, and tile grout, causing permanent pitting and etching.

5. Cyanuric Acid (Sunscreen for Chlorine)

Without stabilizer, sunlight destroys 90% of free chlorine within two hours. Maintain 30 to 50 ppm CYA to protect chlorine longevity.

Related Pool Calculators

All Pool Tools

Pool Volume Calculator

Calculate exact pool volume in gallons and litres for any pool shape.

Pool Chlorine Calculator

Dose liquid chlorine, cal-hypo, or stabilized granules to raise Free Chlorine.

Pool Baking Soda Calculator

Estimate sodium bicarbonate needed to raise Total Alkalinity safely.

Muriatic Acid Pool Calculator

Carbonate-buffered pH reduction using commercial 31.45% or 14.5% muriatic acid.

Frequently Asked Questions: Pool Chemistry

Always adjust chemicals in this specific sequence: 1) Total Alkalinity first (buffers the water), 2) pH second (alkalinity stabilizes pH adjustments), 3) Calcium Hardness, 4) Cyanuric Acid (Stabilizer), and 5) Free Chlorine sanitizer last. Never add all chemicals at the same time.