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Landbased Products

LB 4000 Analog Watermaker
LB 4000 Analog Watermaker

The LB 4000 is an extremely energy efficient reverse osmosis desalination plant designed for stationary or industrial applications. The LB 4000 can treat high salinity brackish water using just a fraction of the energy of conventional small plants The LB 4000 unit is supplied as a modular kit to be installed in an existing building. There are three main components, the Pearson Pump membrane module, the gauge-flow meter panel and an electrical control box. Using simple analog monitoring and controls, these economical units are perfectly suited to remote applications that require the ultimate in reliability and efficiency. In fact, the Spectra LB machines are so efficient, they are often powered from renewable energy.

The Spectra Pearson Pump is a breakthrough pump design. This unique high pressure pump combines feed stream pumping and energy recovery into a single unit. The "Energy Recovery" feature of the Pearson Pump takes the energy entrained in the brine reject stream from the RO membranes and recaptures it, dramatically increasing the overall efficiency. The system does not require continuous monitoring and pressure adjustment as it stays inherently in balance at all times, providing a constant product flow and recovery ratio. The product flow can be controlled via the variable speed drive to the motor. Having a fixed recovery ratio is critical for brackish water applications as it prevents operators from tampering with the recovery ratios and damaging the membranes.

The Spectra Pearson Pump is manufactured from engineered composites and super duplex stainless steel for extreme corrosion resistance.


Flow Guage
gauge-flow meter panel
Spectra Pearson Pump - the most energy efficient desalination pump on the planet!
The Spectra Pearson Pump integrated with Spectra's exclusive oil filtration system for extended service periods.
Motor speed control with external heat sink capable of operating in extreme environments.
Fixed recovery ratio prevents operator from tampering with recovery.
20 and 5 micron Spinring™ industrial prefilter set protects the membranes. Water delivery and pretreatment is site specific and will be engineered for your particular application. Multimedia filters and Ultra filtration options are available from Spectra.
Spectra engineered pressure vessels with proprietary Spectraflux™ membranes.
Analog monitoring and control provides the ultimate in reliability and remote serviceability.
Service valves, service ports and basic installation kit included.
Simple cost effective system.

Technical Specs

Treats brackish water from 1000-24,000 TDS

Gallons per day 4,000 (15,140 liters)
Gallons per hour 180 (685 liters)
Power options Available in 24 VDC, 48 VDC, 120 VAC, and 240 VAC 50/60 hz
Feed water recovery 50%
Salt rejection 99.4% minimum
Feed flow 6 GPM (23 LPM)
Required inlet pressure 20 PSI (1.4 bar)
Membranes 4 ea. Spectraflux TFC 4"x40" Seawater RO
Filters 1 ea 20" 20 micron, 1ea. 20" 5 micron


LB 4000A dimensions

Custom Designs Available!

Spectra Watermakers engineers and builds a full line of marine, mobile and land based desalination systems for sea and brackish water. Many of our systems are custom built to meet our customers applications. Please contact the factory with your requirements.

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