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Pool Salt Dosage Calculator

Standard target is usually 3,000 to 3,400 ppm.

function calculateSaltRequired() { var volume = parseFloat(document.getElementById('poolVolume').value); var current = parseFloat(document.getElementById('currentSalt').value); var target = parseFloat(document.getElementById('targetSalt').value); var resultDiv = document.getElementById('saltResult'); if (isNaN(volume) || isNaN(current) || isNaN(target)) { resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#f8d7da"; resultDiv.style.color = "#721c24"; resultDiv.innerHTML = "Error: Please enter valid numbers in all fields."; return; } if (current >= target) { resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#d4edda"; resultDiv.style.color = "#155724"; resultDiv.innerHTML = "No Salt Needed! Your current salt level is already at or above your target."; return; } var difference = target – current; // Formula: Lbs of Salt = (Target – Current) * (Volume / 1,000,000) * 8.34 var poundsNeeded = (difference / 1000000) * volume * 8.34; var bagsNeeded = poundsNeeded / 40; // Standard 40lb bag resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#e7f3ff"; resultDiv.style.color = "#004085"; resultDiv.innerHTML = "

Results

" + "" + Math.ceil(poundsNeeded) + " lbs of Salt Needed" + "Approximately " + bagsNeeded.toFixed(1) + " bags (40 lbs each)"; }

How to Use the Pool Salt Calculator

Maintaining the correct salinity is crucial for Saltwater Chlorine Generators (SCG) to produce enough sanitizer for your pool. This calculator helps you determine exactly how many pounds of high-purity pool salt you need to reach your ideal ppm (parts per million).

Why Salt Levels Matter

If your salt level is too low, your salt cell will work harder to produce chlorine, shortening its lifespan. If the level is too high, you risk corrosion of metal fixtures and may need to partially drain and refill your pool to dilute the concentration. Most salt systems function best between 3,000 and 3,400 ppm, though you should always check your manufacturer's manual.

Step-by-Step Guide to Adding Salt

• Test Current Levels: Use a digital salt meter or salt test strips. Do not rely solely on the salt generator's reading, as these can be calibrated incorrectly.
• Calculate Your Volume: If you don't know your pool's gallonage, multiply Length x Width x Average Depth x 7.5 (for rectangular pools).
• Choose the Right Salt: Only use 99% pure non-iodized salt specifically labeled for pool use. Avoid rock salt or salt with anti-caking agents.
• Distribute the Salt: Pour the salt around the perimeter of the deep end. Brush the salt until it is completely dissolved to prevent staining.
• Wait to Turn On: Keep your pump running for 24 hours to ensure the salt is fully mixed before turning your salt chlorine generator back on.

Frequently Asked Questions

Q: Can I use regular table salt?
A: Technically yes, but it often contains iodine or anti-caking agents that can stain your pool finish and damage the salt cell. Always use professional pool salt.

Q: How long does it take for salt to dissolve?
A: Depending on the grain size and water temperature, salt typically dissolves in 1 to 4 hours with proper brushing and circulation.

Q: Why is my salt level dropping?
A: Salt does not evaporate. Levels only drop due to water loss from splash-out, backwashing, or leaks. Significant rain can also dilute the concentration.

Example Calculation

Suppose you have a 20,000-gallon pool. Your test shows 2,000 ppm, and your target is 3,200 ppm. You need to increase the level by 1,200 ppm.

Calculation: (1,200 ppm / 1,000,000) * 20,000 Gallons * 8.34 = 200 lbs of salt (or five 40lb bags).