Pool Tip #49: Pool Conversion Factors
Download Pool Tip #49: Pool Conversion Factors (PDF format, 32KB)
| Note: Dosages required to chemically adjust 10,000 gallons of water per 1 ppm |
| Chlorine Compounds | |
|---|---|
| Sodium hypochlorite (10%) | 1.5 cups |
| Sodium hypochlorite (12%) | 1.3 cups |
| Sodium hypochlorite (15%) | 1.0 cups |
| Lithium hypochlorite (35%) | 10.5 ounces |
| Sodium dichloro-s-triazinetrione (60%) | 2.25 ounces |
| Calcium hypochlorite (65%) | 2.0 ounces |
| Trichloro-s-triazinetrione (85%) | 1.5 ounces |
| Gas chlorine (100%) | 1.3 ounces |
| Neutralize Chlorine | |
|---|---|
| Sodium thiosulfate | 1 ounce |
| Sodium sulfate | 3.2 ounces |
| Hydrogen peroxide (35%) | 2.6 fluid ounces |
| Total Alkalinity |
|---|
| Lowering total alkalinity with sodium bisulfate (Volume ÷ 47,056) × ___ ppm desired change = ___ pounds Lowering total alkalinity with muriatic acid (Volume ÷ 125,000) × ___ ppm desired change = ___ quarts Raising total alkalinity with sodium bicarbonate (Volume ÷ 71,425) × ___ ppm desired change = ___ pounds Raising total alkalinity with sodium carbonate* (Volume ÷ 113,231) × ___ ppm desired change = ___ pounds |
| * Use sodium carbonate only if both pH and total alkalinity need to be raised, and TDS and calcium hardness levels are low -- otherwise a white calcium carbonate precipitate will form |
| Calcium Hardness | |
|---|---|
| Calcium chloride (100%) | 1.6 ounces |
| Calcium chloride (77%) | 2 ounces |
| Sodium hexametaphosphate | 6.4 ounces (initial dose) 1.25 ounces (maint. dose per 2 weeks) |
| Stabilizer | |
|---|---|
| Cyanuric acid | 1.3 ounces |
| Langelier Saturation Index |
|---|
| SI = pH + Af + Cf + Tf - TDSf |
| Temp. F° | Calcium Hardness |
Total Alkalinity |
TDS | ||||
|---|---|---|---|---|---|---|---|
| 66 | 0.5 | 75 | 1.5 | 50 | 1.7 | <1000 | 12.1 |
| 77 | 0.6 | 100 | 1.6 | 75 | 1.9 | >1000 | 12.2 |
| 84 | 0.7 | 150 | 1.8 | 100 | 2.0 | ||
| 94 | 0.8 | 200 | 1.9 | 150 | 2.2 | ||
| 105 | 0.9 | 300 | 2.1 | 200 | 2.3 | ||
| 400 | 2.2 | 300 | 2.5 | ||||
| 800 | 2.5 | 400 | 2.6 | ||||
| 1000 | 2.6 |
| Pounds per PPM |
|---|
| If the chemical is 100% full strength (Pool volume × 8.33 pounds per gallon) ÷ 1,000,000 = Pounds required for 1 ppm If the chemical is less than 100% full strength, calculate ppm by Pounds for 1 ppm ÷ Decimal strength = Pounds required for 1 ppm |