TDS Monitors & Controllers

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TDS Monitors for Aquariums - RO/DI Water Quality Control

Monitor the purity of your reverse osmosis water with our professional TDS monitors . Precise devices for measuring total dissolved solids and ensuring pure water for your reef aquarium.

HM Digital DM-1 - Dual Online TDS Monitor

  • Dual display : Before and after filtration
  • Permanent installation : Continuous monitoring
  • Integrated alarm : Resin change alert
  • Simultaneous input/output reading
  • RO/DI system efficiency detection
  • Ideal for permanent systems

HM Digital TRM-1 - Triple Online TDS Monitor

  • Triple display : Tap water, post-RO, post-DI
  • Complete monitoring : Each filtration stage
  • Maximum precision : Detection of specific problems
  • Identify which resin to replace
  • Optimizing replacement costs

HM Digital Basic TDS Meter - Portable

  • Compact and portable : Quick tests
  • Economical : An affordable solution
  • Easy to use : Instant reading
  • Perfect for spot checks
  • Automatic calibration

HM Digital pH/Temp Meter - Combo

  • Dual function : pH and temperature
  • Water resistant : Safe to use
  • Versatile : Multiple tests
  • pH measurement 0-14
  • Temperature in °C or °F

Accessories - John Guest Union in T

  • 1/4" connection : Standard RO/DI
  • Easy installation : QuickConnect
  • To connect monitors online
  • No tools required

What is TDS?

  • TDS (Total Dissolved Solids) : Total dissolved solids
  • Measurement in ppm (parts per million)
  • Includes minerals, salts, metals, ions
  • Water purity indicator

Recommended TDS Values

  • Tap water : 100-400 ppm (variable)
  • After RO : 5-20 ppm
  • After DI : 0-5 ppm (optimal for reefs)
  • Resin replacement : When TDS exceeds 10 ppm

Why Monitor TDS?

  • Detects wear of RO/DI resins
  • Prevents the introduction of contaminants
  • Optimize filter replacement timing
  • Saves costs (change at the right time)
  • Guarantees pure water for sensitive reefs
  • Prevents algae and parameter problems

Online Monitor Installation

  • Install after each filtration stage
  • Use John Guest 1/4" T-unions
  • Connect probes to the waterline
  • Position the screen within sight
  • Calibrate according to instructions

TDS Monitor Maintenance

  • Clean probes regularly
  • Calibrate every 3-6 months
  • Replace batteries as needed
  • Check connections for leaks

Secure delivery throughout Canada. Free delivery available depending on the order amount.

Monitor your water purity with our professional TDS monitors. Guaranteed pure water, optimized resins, protected reef.