Chapin® Mixes on Exit™ (M.O.E.) Backpack Sprayer — 4gal Capacity

Mix On Demand at the Nozzle, Not the Tank, 4gal

Pre-mixing a full backpack tank before spraying almost always leaves some solution behind at the end of the session, and that leftover concentrate is either wasted or disposed of as chemical waste. The Chapin M.O.E. system flips the order: the 4-gallon tank holds plain water, and concentrate is metered in and diluted automatically at the nozzle as you spray.

That means every pass applies a freshly mixed, correctly diluted solution, with nothing premixed sitting in the tank to dispose of afterward, a real advantage for commercial growers running IPM programs and foliar feeding schedules across large canopy areas.

Key Features & Benefits

• Mixes on Exit™ technology — concentrate and water combine at the nozzle in real time, with no pre-mixing and no leftover solution to dispose of.
• 4-gallon water tank — supports extended spray sessions across commercial-scale canopy areas without frequent refills.
• Reduces chemical waste — on-demand mixing eliminates leftover premixed solution, cutting concentrate costs and disposal needs.
• Consistent dilution ratio — inline mixing holds a steady concentrate-to-water ratio throughout the session for more accurate application.
• Ergonomic backpack design — padded shoulder straps and back panel spread the tank load comfortably across long sessions.

Who Should Use This

Commercial growers, IPM technicians, and facility managers who spray regularly across large growing areas and want to cut chemical waste and skip pre-mixing full tank volumes before every session are the direct fit, particularly in large indoor grow rooms and greenhouse ranges.

About Chapin

Chapin International has built spray equipment domestically since 1884, running production today out of Batavia, New York and a Kentucky manufacturing site.

Frequently Asked Questions

What spray products work with the M.O.E. system?

It is compatible with most water-soluble concentrate pesticides, foliar feeds, and biological inputs. Verify chemical compatibility with the sprayer's components and the concentrate's viscosity before use.

How do I adjust the dilution ratio?

The mixing chamber includes adjustable dilution settings. Refer to Chapin's instructions for setting the correct ratio for your specific concentrate and application rate.

When should I clean the M.O.E. system?

Flush the water tank, mixing chamber, wand, and nozzle with clean water after every use. For residue-prone concentrates, run a cleaning solution through the system per the product's safety data sheet.

Is this backpack comfortable for extended sessions?

Yes, the padded ergonomic design is built for extended spray sessions. Adjust the shoulder straps to distribute the full tank load evenly before beginning application.