Plan dichlor dosing for irrigation tanks and sprayers. Choose units, set ppm goals, and strength. Get clear grams, teaspoons, and exportable logs instantly today.
When delta ppm is zero, the needed dose becomes zero.
Use a scale whenever accuracy matters.
This tool supports export after a successful calculation.
| Tank Volume | Current (ppm) | Target (ppm) | Avail. Chlorine | Purity | Result (grams) |
|---|---|---|---|---|---|
| 50 L | 0 | 2 | 55% | 99% | 0.1837 g |
| 200 L | 0.5 | 3 | 56% | 98% | 0.9157 g |
| 25 US gallons | 0 | 1.5 | 60% | 100% | 0.2366 g |
Examples are illustrative. Always verify product labeling and measure carefully.
Spoon estimates use your grams-per-teaspoon value. Granules can pack differently, so weighing is the most reliable method.
Safety reminder: label directions vary by brand and application. Avoid overdosing, and keep chemicals away from children, pets, and edible harvest areas until safe.
Clean irrigation water helps protect emitters, sprayer nozzles, and storage tanks from biofilm buildup. Dichlor releases free chlorine quickly, so small dosing errors can swing results. This calculator standardizes dosing for tank sizes and products, reducing trial-and-error and improving repeatable sanitation. For example, a 200‑liter tank at a 2 ppm increase needs about 400 mg of available chlorine, not “a scoop.”
Parts per million (ppm) is milligrams of free chlorine per liter of water. If your target is 2 ppm, each liter needs about 2 mg of available chlorine. Multiply liters by the ppm increase to estimate total milligrams required, then convert to grams for easier weighing. A 50‑liter sprayer moving from 0 to 3 ppm needs roughly 150 mg, which is 0.150 g of available chlorine.
Label strength is the available chlorine percentage, while purity reflects how much of the product is active. Lower strength or lower purity increases the grams needed for the same ppm rise. The calculator divides the required available chlorine grams by the strength and purity fractions, producing a realistic product dose. If strength is 55% and purity is 99%, the dose is higher than the available chlorine amount by about 1/(0.55×0.99).
Pre-dissolve granules in a small bucket of water, then add to the main tank with circulation to prevent clumping. Wait several minutes, then retest free chlorine near the outlet. If readings differ from the target, adjust in small increments and recheck to avoid overshooting. Sunlight, high organics, and warm water can reduce residual, so test again after 20–30 minutes.
Use the CSV or PDF export to log volume, starting ppm, target ppm, and final dose. Keeping consistent records helps identify seasonal changes, organic load, and water source variability. When the same tank is refilled often, the saved results become a reliable starting point for faster setup. Logs also support checklists, staff training, and consistent dosing when multiple operators share the same equipment.
It returns the estimated grams of dichlor product needed to raise free chlorine from your current ppm to your target ppm for the selected water volume, adjusted for strength and purity.
Products differ in available chlorine. A lower percentage means you need more grams of product to deliver the same chlorine increase, so the dose must scale with label strength.
Spoon measures are approximate because granules pack differently. Use a kitchen scale when accuracy matters, and treat spoon values as convenience estimates only.
Enter 0 ppm as a conservative starting point, dose to a modest target, mix well, then test. Adjust with small additional doses until the measured ppm matches your goal.
No. Run one calculation to store the last result. Then the CSV and PDF buttons export that saved set of inputs and outputs for quick recordkeeping.
Follow product label directions and avoid contact with edible parts unless guidance allows it. Keep doses low, mix thoroughly, and store chemicals securely away from children and pets.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.