Soft Wash vs Pressure Wash Chemical Dilution Calculator

ANA›Life Services Authority›National Calculator Authority›Soft Wash vs Pressure Wash Chemical Dilution Calculator

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Soft Wash vs Pressure Wash Chemical Dilution Calculator

Calculate the exact amount of chemical concentrate and water needed for soft wash (low-pressure, high-chemical) and pressure wash (high-pressure, low-chemical) applications. Enter your tank volume, desired concentration, and chemical stock strength to get precise mixing instructions.

### Common Settings

Total Tank / Batch Volume (gallons)

Chemical Stock Strength (% active ingredient)

Example: Standard sodium hypochlorite (bleach) pool shock = 12.5%, household bleach = 3–8%

### Soft Wash Settings

Soft Wash Target Concentration (% active ingredient)

Typical soft wash range: 0.5% – 3% for roofs, siding, and organic stain removal

Surfactant Addition (% of final mix volume)

Optional. Typical surfactant rate: 0.25% – 1% of total mix volume

### Pressure Wash Settings

Pressure Wash Target Concentration (% active ingredient)

Typical pressure wash downstream injection range: 0.05% – 0.5%

Downstream Injector Dilution Ratio (X:1, water:chemical)

Most downstream injectors dilute at 10:1 to 20:1. Leave blank if not using injector.

Calculate

function sofCalc() { const resultDiv = document.getElementById('sof-result'); resultDiv.style.display = 'none'; resultDiv.innerHTML = '';

// --- Inputs --- const tankVol = parseFloat(document.getElementById('sof-tank-volume').value); const stockStrength = parseFloat(document.getElementById('sof-stock-strength').value); const swTarget = parseFloat(document.getElementById('sof-sw-target').value); const surfactantPct = parseFloat(document.getElementById('sof-sw-surfactant-pct').value) || 0; const pwTarget = parseFloat(document.getElementById('sof-pw-target').value); const injectorRatio = parseFloat(document.getElementById('sof-pw-injector-ratio').value) || 0;

// --- Validation --- const errors = []; if (isNaN(tankVol) || tankVol 100) errors.push("Stock strength must be between 0.1 and 100%."); if (isNaN(swTarget) || swTarget stockStrength) errors.push("Soft wash target concentration cannot exceed stock strength (" + stockStrength + "%)."); if (isNaN(pwTarget) || pwTarget stockStrength) errors.push("Pressure wash target concentration cannot exceed stock strength (" + stockStrength + "%)."); if (surfactantPct 10) errors.push("Surfactant percentage must be between 0 and 10%."); if (injectorRatio 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

// ============================================================ // SOFT WASH CALCULATIONS // C1 * V1 = C2 * V2 → V_chemical = (C2 / C1) * V_total // ============================================================ const swChemVol = (swTarget / stockStrength) * tankVol; // gallons of concentrate const swSurfactantVol = (surfactantPct / 100) * tankVol; // gallons of surfactant const swWaterVol = tankVol - swChemVol - swSurfactantVol; // gallons of water const swDilutionRatio = (stockStrength / swTarget).toFixed(2); // X:1 dilution

// ============================================================ // PRESSURE WASH CALCULATIONS (direct mix in tank) // C1 * V1 = C2 * V2 → V_chemical = (C2 / C1) * V_total // ============================================================ const pwChemVol = (pwTarget / stockStrength) * tankVol; // gallons of concentrate const pwWaterVol = tankVol - pwChemVol; // gallons of water const pwDilutionRatio = (stockStrength / pwTarget).toFixed(2); // X:1 dilution

// ============================================================ // DOWNSTREAM INJECTOR CALCULATION (if injector ratio provided) // The injector further dilutes the tank mix at the gun. // Required tank concentration = pwTarget * (injectorRatio + 1) // because: C_tank / (injectorRatio + 1) = C_at_surface // ============================================================ let injectorHTML = ''; if (injectorRatio > 0) { const requiredTankConc = pwTarget * (injectorRatio + 1); if (requiredTankConc > stockStrength) { injectorHTML = '⚠️ With a ' + injectorRatio + ':1 injector, the required tank concentration would be ' + requiredTankConc.toFixed(3) + '%, which exceeds your stock strength of ' + stockStrength + '%. Use a lower injector ratio or a stronger stock chemical.

'; } else { const injChemVol = (requiredTankConc / stockStrength) * tankVol; const injWaterVol = tankVol - injChemVol; injectorHTML = ` #### Downstream Injector Mix (for ${injectorRatio}:1 injector)

To achieve ${pwTarget}% at the surface after ${injectorRatio}:1 injector dilution, your tank mix must be ${requiredTankConc.toFixed(3)}%.

ComponentAmount (gal)Amount (oz) Chemical Concentrate${injChemVol.toFixed(3)}${(injChemVol * 128).toFixed(1)} Water${injWaterVol.toFixed(3)}${(injWaterVol * 128).toFixed(1)} Total Tank Volume${tankVol.toFixed(2)}${(tankVol * 128).toFixed(1)}

Effective surface concentration after injector: ${pwTarget}%

`; } }

// --- Validation: water volume must be positive --- let swWarning = ''; if (swWaterVol ComponentAmount (gal)Amount (oz)Amount (L) Chemical Concentrate${swChemVol.toFixed(3)}${(swChemVol * 128).toFixed(1)}${(swChemVol * 3.78541).toFixed(3)} ${surfactantPct > 0 ? Surfactant (${surfactantPct}%)${swSurfactantVol.toFixed(3)}${(swSurfactantVol * 128).toFixed(1)}${(swSurfactantVol * 3.78541).toFixed(3)} : ''} Water${Math.max(swWaterVol, 0).toFixed(3)}${(Math.max(swWaterVol, 0) * 128).toFixed(1)}${(Math.max(swWaterVol, 0) * 3.78541).toFixed(3)} Total${tankVol.toFixed(2)}${(tankVol * 128).toFixed(1)}${(tankVol * 3.78541).toFixed(3)}

Dilution ratio: 1 part chemical : ${(swDilutionRatio - 1).toFixed(2)} parts water (${swDilutionRatio}:1 total)

#### 💧 Pressure Wash Mix — Direct Tank (Target: ${pwTarget}%)

${pwWarning}

ComponentAmount (gal)Amount (oz)Amount (L) Chemical Concentrate${pwChemVol.toFixed(3)}${(pwChemVol * 128).toFixed(1)}${(pwChemVol * 3.78541).toFixed(3)} Water${Math.max(pwWaterVol, 0).toFixed(3)}${(Math.max(pwWaterVol, 0) * 128).toFixed(1)}${(Math.max(pwWaterVol, 0) * 3.78541).toFixed(3)} Total${tankVol.toFixed(2)}${(tankVol * 128).toFixed(1)}${(tankVol * 3.78541).toFixed(3)}

Dilution ratio: 1 part chemical : ${(pwDilutionRatio - 1).toFixed(2)} parts water (${pwDilutionRatio}:1 total)

${injectorHTML}

#### 📊 Side-by-Side Comparison

ParameterSoft WashPressure Wash Target Concentration${swTarget}%${pwTarget}% Chemical Used (gal)${swChemVol.toFixed(3)}${pwChemVol.toFixed(3)} Chemical Used (oz)${(swChemVol * 128).toFixed(1)}${(pwChemVol * 128).toFixed(1)} Water Used (gal)${Math.max(swWaterVol, 0).toFixed(3)}${Math.max(pwWaterVol, 0).toFixed(3)} Dilution Ratio (total)${swDilutionRatio}:1${pwDilutionRatio}:1 Chemical Strength vs Soft WashBaseline${(swTarget / pwTarget).toFixed(1)}× weaker

`; }

#### Formulas Used

Dilution Formula (C₁V₁ = C₂V₂):

Downstream Injector Formula:

Surfactant Volume = (Surfactant % ÷ 100) × Total Volume

#### Assumptions & References

More Calculators

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References

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