Calculator
Example data table
| Scenario | Volume | Current → Target | Type | Form | Result (approx) |
|---|---|---|---|---|---|
| Rain barrel after storm | 200 L | 80 NTU → 20 NTU | Polymer | Liquid, 50 mg/mL | ~13.20 mL (with 110% safety) |
| Hydro reservoir cleanup | 60 US gal | 60 NTU → 10 NTU | Chitosan | Liquid, 30 mg/mL | ~41.60 mL (with 110% safety) |
| Pond pre-filter step | 1.5 m³ | 120 NTU → 40 NTU | Alum | Powder, 85% purity | ~139.80 g (with 110% safety) |
Formula used
1) Convert volume to liters: VL.
2) Turbidity reduction: ΔNTU = max(NTUcurrent − NTUtarget, 0).
3) Base dose (mg/L): Dmg/L = coef × ΔNTU, then clamp to the recommended min/max.
4) Total active (mg): M = Dmg/L × VL.
5) Safety adjustment: Msafe = M × (Safety% ÷ 100).
Liquid: mL = Msafe ÷ Concentration(mg/mL).
Powder: g = (Msafe ÷ PurityFraction) ÷ 1000.
Kitchen measures are rough and depend on density.
Cost uses your selected unit price and final dose.
How to use this calculator
- Measure your water volume and pick the correct unit.
- Select the clarifier type closest to your product.
- Choose turbidity-based dosing, or use your label dose.
- Enter concentration for liquids, or purity for powders.
- Start with a small jar-test to confirm performance.
- Export CSV or PDF for repeatable treatment records.
Professional guidance
Water clarity and plant health
Clarifier dosing in garden reservoirs is a water-quality control step, not a shortcut. Suspended fines block light, coat roots, and trap nutrients in sludge. Cloudy water also reduces dissolved oxygen transfer and can hide early algae blooms. A calculated dose helps particles bind, settle, and restore consistent circulation and filtration.
Choosing a dosing method
Use turbidity-based dosing when you have a meter reading and want repeatable adjustments. The calculator converts volume, estimates needed reduction, and applies a safety factor for mixing losses. Use fixed label dosing when the product specifies mL or g per 1000 liters and you want label-compliant application. If you have jar-test data, enter an override mg/L to match real settling behavior.
Interpreting the dose result
The output shows a final product amount plus an active-mass breakdown. Base dose is expressed in mg per liter, which scales cleanly with volume changes and makes comparisons across tanks easy. Polymer clarifiers often work at low mg/L, chitosan may need more, and alum usually requires higher doses. If the reduction required is zero, the recommended dose drops to a minimal maintenance level.
Operational best practices
Run a quick jar-test before treating the full system, especially for sensitive crops. Add product slowly into strong mixing, then maintain aeration for uniform contact. Temperature, pH, and alkalinity affect floc formation; alum can pull pH downward, so monitor and correct gently. After settling, drain sludge, rinse screens, and clean pre-filters. Avoid overdosing, which can re-suspend solids, increase viscosity, or stress beneficial microbes.
Recordkeeping and cost control
Consistent records improve outcomes over time. Export CSV for logbooks and PDF for compliance or client reports. Track turbidity, dose, settling time, and visible results, then refine your override dose and safety factor. Adding price data estimates treatment cost per event, supports budgeting, and helps compare products by cost per clarified liter. Review seasonal trends to plan maintenance before storms and heavy feeding.
FAQs
Can I use this for hydroponic nutrient tanks?
Yes. Use the measured tank volume and choose a compatible clarifier. Start with a jar-test, dose conservatively, and monitor pH, EC, and root appearance after settling and filtration.
What if I don’t have a turbidity meter?
Use the fixed label dose mode from your product instructions, or run a jar-test series to find an effective mg/L override. Visual clarity alone is unreliable, especially with fine silt.
Why does the calculator ask for concentration or purity?
The dose math is based on active mass. Concentration converts required mg into liquid milliliters. Purity converts required active mg into powder grams, accounting for inactive carriers.
How fast should water clear after dosing?
Many systems show floc within minutes and clearer water within 1–12 hours, depending on solids load and mixing. Keep circulation gentle after initial mixing so floc can settle.
Is a higher safety factor always better?
No. A small buffer helps compensate for mixing loss, but too much can cause haze, re-suspension, or plant stress. Use the lowest effective dose confirmed by jar-testing.
Will clarifiers remove dissolved nutrients?
Clarifiers primarily target suspended particles, not dissolved ions. However, settled sludge can trap nutrients and organics, so remove sediment promptly and recheck nutrient levels afterward.