Sentry I Open Air · G140
G140 Series
Higher-capacity open-air aeration available in low-yield and 25 GPM configurations for homes and small systems with greater demand.
Overview
The Sentry I G140 Series Open-Air System
The G140 Series • Higher Capacity • 25 GPM • Open-Air System
The G140 Series extends the Sentry I Open Air line with the same treatment options as the G130, offering higher capacity up to 25 GPM. The G140 can also be configured into a Low-Yield setup with the 10 GPM pump. In low-yield configuration, this two-tank system holds 110 gallons of usable water. Need more water, just add additional tank(s). Each additional tank will provide 90 more gallons of storage.
Low-yield and 25 GPM configurations let installers match the unit to well recovery rate and household demand.
The G140 Series system is designed to do everything the typical Open-Air System will do plus the ability to hold extra water for Low-Yield wells or contact time for High-Flow applications.

Common applications
Where this system is commonly used
Capacity
Higher-demand homes
Suited to applications where treated-water demand exceeds compact residential units.
Supply
Low-yield wells
A low-yield configuration is available for wells with limited recovery rates.
Odor
Sulfur & iron
Commonly used to support reduction of sulfur odor and iron staining.
System fit
How it fits into a treatment system
Like other Open Air Systems, the G140 Series is typically installed ahead of filtration, providing aeration to support oxidation.
The 25 GPM configuration is often paired with appropriately sized storage and pressure equipment to maintain consistent delivery.
Key features
Key features
- Higher-capacity open-air aeration
- Low-yield and 25 GPM configurations
- Same treatment options as the G130
- Serviceable, dealer-supported components
- Commonly installed ahead of filtration
Literature
Manuals & spec sheets
Related
Related products

Gas Reduction System (G130)
Compact open-air aeration for residential well applications.
View product
Air Stripping Package
Air-Stripping is commonly used to reduce hard-to-treat gases like radon and CO2, along with odor reduction from water. This package can be installed on either the G130 or G140.
View product