Contact Product Expert

Jeff Holland
Product Manager


Laboratory Deionization Recirculating Systems (LDIRS)

​The Evoqua Water Technologies LDIRS Series water purification system is a complete, factory assembled, water system designed to deliver up to 3 gpm (11 lpm) or 4 gpm (15 lpm) of deionized water, depending on the application need. These systems are built and shipped with either a valve to supply at point-of-use or can be reconfigured to be installed with a customer’s distribution loop.

The system is available in two models: A wall mountable LDIRS03 and the larger 4 gpm (15 lpm) skid mounted unit. Each system can be configured to recirculate through all deionization (DI) tanks or just the final polishing, mixed bed DI tanks, which are purchased separately.


​​A compact, LDIRS 03wall mountable panel capable of supplying up to 3gpm (11 lpm) deionized water to a distribution loop of us to 100 linear feet.



​This larger skid mounteLDIRS 04d system is capable of supplying up to 4 gpm (15 lpm) of deionized water to a larger distribution loop of up to 500 linear feet.



  • ​Dual Filtration: 1.0 micron pre-treatment filtration and 0.2 micron final filtration
  • Bacteria destruct ultraviolet sterilizer (254 mm)
  • Continuous recirculation through UV sterilizer and 0.2 micron final filtration
  • Easy dispense valve for point-of-use dispense
  • Built-in ground fault circuit interrupter (GFCI)


  • ​Systems can be upgraded
  • Pre-manufactured for fast installations
  • Both wall panel and skid mounted system have small footprint to conserve space (additional space required for service LDIRS04 exchange bottles)

LDIRS Flow Charts


 System Parameters

Model​Flow Rate (max)​Feed Water Pressure​Feed Water Temperature
​LDIRS03​3 gpm (11 lpm)​min. 40 psig (2.7 bar)
max. 90 psig (6.2 bar)
​min. 50°F (10°C)
max. 90°F (32°C)
​LDIRS04​4 gpm (15 lpm)​min. 40 psig (2.7 bar)
max. 90 psig (6.2 bar)
​min. 50°F (10°C)
max. 90°F (32°C)


 System Specifications

ModelElectricalOverall Dimensions in (cm)​Frame MaterialsPiping Materials
​LDIRS03​115 VAC grounded receptacle​38"L x 9"D x 40"H
(96L x 23D x 102H cm)
​White polyethylene​S-80 PVC and Polyethylene tube
​LDIRS04​115 VAC grounded receptacle​30 L x 24 D x 65"H
(76L x 61D x 165H cm)
​Powder coated carbon steel​S-80 PVC

 Evoqua Laboratory Products

jeffrey.holland@evoqua.com LDIRS