| Scenario | Key inputs | Typical output |
|---|---|---|
| Greenhouse benches | 300 sq ft, normal spray, 200 ppm, 6% bleach | ~0.18 gal mix, ~14 mL bleach, remainder water |
| Tool soak bin | 10 L mix, 1% target, 3% peroxide | ~3.33 L peroxide, ~6.67 L water |
| Drip line flush | 250 ft, 13 mm ID, 2 lines, 20% purge | ~10–15 L flush volume before extra mix factor |
Examples are illustrative. Always follow your product label and local guidance.
- Surface spray volume: gallons = (area ÷ 100) × application rate.
- Irrigation line volume: liters = π × (d ÷ 2)² × length × lines × 1000.
- Extra volume: total = base × (1 + purge% + mix%).
- Bleach (ppm): mL = (ppm × liters) ÷ (bleach% × 10).
- Percent dilution: concentrate = (target% ÷ product%) × total volume.
- Label rate: mL = (oz per gal × gallons) × 29.5735.
These are planning equations. For regulated uses, defer to the label.
- Choose a mode: surfaces for spray-down, or irrigation for line flush.
- Select your chemical and enter the label strength or rate.
- Adjust the extra mix factor to cover waste and pickup.
- Press calculate to see concentrate and water amounts.
- Download CSV for records, or PDF for a printed mix sheet.
Keep children and pets away from the mixing area.
Season closing work reduces disease carryover, biofilm buildup, and odor before storage. This calculator turns your cleaning plan into measurable batches, so benches, trays, tanks, and hoses receive a consistent dose. Start by choosing whether you are treating surfaces or flushing irrigation lines, because volume estimation changes the entire mix.
Include contact time in your plan, then drain and dry equipment. Cleaners remove soil, disinfectants reduce microbes, and antifreeze blends protect lines where freezing is expected during cold nights.
For surfaces, the tool estimates spray volume from area and an application rate expressed as gallons per 100 square feet. Light misting fits smooth plastics, while heavy wetting supports porous wood or rough concrete. For irrigation, volume is derived from pipe geometry: π×(diameter/2)²×length×lines. An extra purge percentage captures manifolds, filters, emitters, and drain-down losses.
Four dosing approaches are supported. Chlorine solutions use a target ppm, converting to concentrate milliliters using product strength. Peroxide and propylene glycol use percent blends, scaling concentrate as target% divided by product%. Quaternary sanitizer follows label rate in ounces per gallon. Each model outputs concentrate plus water, and the extra mix factor cushions measuring and sprayer pickup.
Results are shown in liters and gallons for the working solution, and in milliliters and fluid ounces for concentrate. This dual-unit presentation supports metric greenhouses and imperial shop tools. Use the CSV export for logbooks and compliance notes, and the PDF mix sheet for the mixing station. Consistent records help compare chemical use by zone and season.
Always verify label compatibility with metals, seals, and irrigation components. Never mix bleach with acids or ammonia, and rinse edible-contact tools after disinfection. Prepare fresh solution daily when possible, and test on a small surface before full application. If lines were fertilized, pre-flush with clean water to reduce demand and improve sanitizer performance.
Which mode should I choose for my closing routine?
Use Surface sanitation for benches, walls, trays, tools, and floors. Use Irrigation line flush when you must fill tubing and emitters with a measured solution or winterizing blend.
What does the extra mix factor change?
It increases the planned batch volume to cover sprayer pickup, measuring loss, and small spills. The concentrate and water amounts scale automatically with that percentage.
Can I trust the bleach ppm calculation exactly?
It is a planning approximation based on product percent. Different labels and strengths vary, and chlorine demand from organic soil reduces active ppm. Follow the label and verify with test strips when needed.
Why does irrigation volume use diameter and length?
Tubing is a cylinder. The calculator estimates internal volume from cross‑sectional area and length, then adds a purge percentage for fittings, filters, and manifolds.
How should I handle cost estimates?
Enter your concentrate price and unit. The tool estimates concentrate cost only, not water, labor, or disposal. Use it to compare chemicals across zones and seasons.
What are quick best practices for better results?
Remove debris first, pre‑rinse lines if fertilized, mix fresh solution, keep recommended contact time, and rinse food‑contact items. Store equipment dry to reduce corrosion and microbial regrowth.