Product Description
MONITOR YOUR RO/DI FILTRATION SYSTEM WITH PRECISION
The HM Digital FLM-3 Consumer Flow Meter is the perfect solution for monitoring water flow through your reverse osmosis (RO) or deionization (DI) filtration system. Designed for under-the-sink or countertop installations, this compact flow meter helps you track exactly how much water has passed through your filters—so you know precisely when it's time for replacement.
WHY CHOOSE THE FLM-3 FLOW METER?
Dual flow rate monitoring – Switch between liters per minute (LPM) or gallons per minute (GPM)
Total volume tracking – Tracks cumulative liters or gallons used up to 99,999
Programmable alarm – Set custom alerts to notify you when filter replacement is needed
Large LCD display – Easy-to-read screen shows flow rate and total volume at a glance
Perfect fit – Unique compact design ideal for under-sink or countertop RO/DI systems
NEVER GUESS WHEN TO CHANGE FILTERS AGAIN
Stop relying on guesswork or calendar reminders to determine when your RO or DI filters need replacement. The FLM-3 gives you precise data on exactly how much water has passed through your filtration system, allowing you to replace filters based on actual usage rather than estimated timeframes. This ensures optimal water quality while maximizing filter life and avoiding premature replacements.
KEY FEATURES
Dual Measurement Modes
Monitor flow rates in liters per minute (LPM) or gallons per minute (GPM) depending on your preference. The meter accurately measures flow rates from 0.8–8.0 LPM or 0.2–2.1 GPM, covering the typical range for residential RO/DI systems.
Cumulative Volume Tracking
Track total water volume from 0 to 99,999 gallons or liters. This cumulative counter helps you monitor filter cartridge capacity and plan replacements based on manufacturer specifications.
Programmable Alarm System
Set a custom alarm threshold based on your filter's rated capacity. When the programmed volume is reached, the FLM-3 emits an audible beep alert—reminding you it's time to replace your filters before water quality degrades.
Large, Easy-to-Read LCD Display
The clear LCD screen displays both current flow rate and total volume simultaneously, making it easy to monitor your system's performance at a glance—even in dimly lit under-sink installations.
Simple Installation
The FLM-3 features standard 1/4" quick-connect fittings that integrate seamlessly with most RO/DI systems. No special tools or plumbing expertise required—just connect inline between your filter stages or at the output.
Long Battery Life
Powered by two standard 1.5V AA batteries (included), the FLM-3 delivers approximately 18 months of continuous monitoring—minimizing maintenance and ensuring reliable operation.
Compact Design
At just 2.6" × 3.5" × 2.5" (6.6 × 9.0 × 6.3 cm) and weighing only 7.3 oz (207g), the FLM-3 fits easily in tight under-sink spaces without interfering with other plumbing or storage.
IDEAL APPLICATIONS
Reverse osmosis (RO) drinking water systems
Deionization (DI) water purification systems
Aquarium RO/DI water production
Hydroponic nutrient solution preparation
Laboratory water filtration monitoring
Coffee and beverage equipment water filtration
Any application requiring precise water volume tracking
HOW IT WORKS
Install the FLM-3 inline with your RO/DI system using the included 1/4" quick-connect fittings. As water flows through the meter, it accurately measures both the instantaneous flow rate and cumulative volume. Program the alarm to match your filter's rated capacity (for example, 500 gallons), and the meter will alert you when it's time for replacement—taking the guesswork out of filter maintenance.
TECHNICAL SPECIFICATIONS
Specification
Detail
Model
FLM-3
Flow Rate Range
0.8–8.0 LPM / 0.2–2.1 GPM
Total Volume Range
0–99,999 gallons or liters
Accuracy
±10%
Flow Rate Resolution
0.1 LPM / 0.1 GPM
Volume Resolution
1 gallon / 1 liter
Alarm Set Point
Fully programmable
Alarm Type
Audible beep
Fittings
1/4" quick connect (standard RO/DI size)
Power Source
Two 1.5V AA batteries (included)
Battery Life
Approximately 18 months
Display
Large LCD with simultaneous flow rate and total volume
Dimensions
6.6 × 9.0 × 6.3 cm (2.6" × 3.5" × 2.5")
Weight
207g (7.3 oz)
SKU
50010
UPC
891144000465
WHAT'S INCLUDED
HM Digital FLM-3 Consumer Flow Meter
Two 1.5V AA batteries
1/4" quick-connect fittings (pre-installed)
Instruction manual
MAXIMIZE YOUR FILTRATION INVESTMENT
Your RO/DI filtration system is an investment in pure, clean water. The FLM-3 helps you protect that investment by ensuring you replace filters at exactly the right time—not too early (wasting money) and not too late (compromising water quality). With precise volume tracking and programmable alerts, you'll maintain optimal system performance while extending the life of your filtration equipment.
The HM Digital FLM-3 Consumer Flow Meter—because knowing is better than guessing when it comes to water quality.
