Drain Cleaning Chemical Dilution Calculator
ANA›Life Services Authority›National Calculator Authority›Drain Cleaning Chemical Dilution Calculator
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Drain Cleaning Chemical Dilution Calculator
Calculate how much concentrated drain cleaning chemical to mix with water to achieve your desired working concentration. Supports both percentage-based and ratio-based dilutions.
Stock Solution Concentration (%)
Concentration of the concentrated chemical (from label)
Target Working Concentration (%)
Desired concentration of the diluted solution
Final Solution Volume Needed
Total volume of working solution you want to prepare
Volume Unit
Litres (L) Millilitres (mL) US Gallons (gal) US Pints (pt) US Fluid Ounces (fl oz)
Calculate
function draCalc() { var resultDiv = document.getElementById('dra-result'); resultDiv.style.display = 'block';
var stockConc = parseFloat(document.getElementById('dra-stock-conc').value); var targetConc = parseFloat(document.getElementById('dra-target-conc').value); var finalVol = parseFloat(document.getElementById('dra-final-vol').value); var unitFactor = parseFloat(document.getElementById('dra-vol-unit').value); var unitSelect = document.getElementById('dra-vol-unit'); var unitLabel = unitSelect.options[unitSelect.selectedIndex].text.match(/(([^)]+))/)[1];
// --- Validation --- if (isNaN(stockConc) || isNaN(targetConc) || isNaN(finalVol)) { resultDiv.innerHTML = 'Please fill in all fields.
'; return; } if (stockConc 100) { resultDiv.innerHTML = 'Stock concentration must be between 0.01% and 100%.
'; return; } if (targetConc 100) { resultDiv.innerHTML = 'Target concentration must be between 0.01% and 100%.
'; return; } if (targetConc >= stockConc) { resultDiv.innerHTML = 'Target concentration must be less than the stock concentration. You cannot dilute to a higher concentration.
'; return; } if (finalVol = 1000) return n.toFixed(0); if (n >= 100) return n.toFixed(1); if (n >= 10) return n.toFixed(2); if (n >= 1) return n.toFixed(3); return n.toFixed(4); }
resultDiv.innerHTML = '### Dilution Results ' + '' + 'ParameterValue' + 'Chemical (stock) to add' + fmt(stockVol) + ' ' + unitLabel + '' + 'Water to add' + fmt(waterVol) + ' ' + unitLabel + '' + 'Total working solution' + fmt(finalVol) + ' ' + unitLabel + '' + 'Dilution ratio (water : chemical)' + dilutionRatio.toFixed(1) + ' : 1' + 'Chemical fraction of final solution' + chemPercent.toFixed(2) + '%' + 'Active ingredient concentration' + targetConc.toFixed(2) + '% (' + ppm.toFixed(0) + ' ppm)' + '' + 'Mixing instruction: Add ' + fmt(stockVol) + ' ' + unitLabel + ' of the ' + stockConc + '% concentrate to ' + fmt(waterVol) + ' ' + unitLabel + ' of water to obtain ' + fmt(finalVol) + ' ' + unitLabel + ' of a ' + targetConc + '% working solution.
' + '⚠ Always add chemical to water, never water to chemical. Wear appropriate PPE (gloves, eye protection). Follow the product SDS.
'; }
#### Formula
Based on the dilution equation (conservation of solute mass):
C₁ × V₁ = C₂ × V₂
- C₁ = Stock (concentrate) concentration (%)
- V₁ = Volume of stock solution required
- C₂ = Target (working) concentration (%)
- V₂ = Total final volume of working solution
Solving for V₁: V₁ = (C₂ / C₁) × V₂
Volume of water to add: V_water = V₂ − V₁
Dilution ratio (water : chemical): R = V_water / V₁
Concentration in ppm: ppm = C₂ × 10,000 (since 1% = 10,000 ppm)
#### Assumptions & References
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