500 LPH Industrial RO Plant — Price, Specs & Suitability

A 500 LPH plant produces around 500 litres of treated water for every hour it runs — so roughly 4000 to 5000 litres across a normal working day, depending on run hours and storage.

Two adjustments matter in practice. Rated output assumes design feed conditions; as feed TDS rises and membranes age, actual output falls, typically by 10-20% over a membrane's life. And if your demand is concentrated into a short peak, storage rather than extra plant capacity is almost always the cheaper answer.

• Microprocessor-based control with auto start/stop
• FRP pressure vessels with SS high-pressure pump
• Full pre-treatment train: sand, carbon, antiscalant dosing
• Automatic membrane flushing
• UV + ozone post-treatment options

This capacity is typically specified for: factories, hospitals, large complexes, societies of 60-150 flats.

If your requirement sits near the boundary between two capacities, size up. Running a plant at 95% of rated capacity continuously shortens membrane and pump life, and leaves no headroom for growth or for the output decline that comes with membrane ageing.

Commercial and industrial systems are engineered as a treatment train, not a single appliance. Each module protects the one after it, and skipping a stage to save capex is the most common reason plants fail early.

• Pre-treatment module — multigrade sand filter removes suspended solids and turbidity; activated carbon filter strips chlorine and organics that would oxidise the RO membrane.
• Softening or antiscalant dosing — protects membranes from calcium and magnesium scaling. On hard feed water this is not optional.
• High-pressure RO module — heavy-duty booster pump drives feed water through industrial spiral-wound membranes at 12-18 bar.
• Post-treatment disinfection — UV disinfection and/or ozonation, with mineral dosing where potable taste matters.
• Microprocessor / PLC control — auto start-stop on tank level, dry-run protection, low and high pressure cut-offs, and timed membrane flushing to extend membrane life.

Capital cost is usually 30-40% of what a commercial water system costs you over five years. The rest is power, membrane and cartridge replacement, reject water, and labour. Two plants with identical price tags can differ by 60% in five-year TCO.

• Power — energy-efficient pumps and correctly sized motors are the largest controllable operating cost on plants above 500 LPH.
• Recovery ratio — a plant recovering 70% instead of 45% cuts both your feed water bill and your reject disposal volume substantially.
• Membrane life — driven almost entirely by pre-treatment quality and flushing discipline, not by membrane brand.
• Consumables — cartridge filters, antiscalant and salt for softener regeneration, budgeted monthly rather than as surprises.
• AMC and downtime — for a production facility, unplanned downtime usually dwarfs every other line item.

Commercial buyers are buying uptime, so the commercial terms matter as much as the equipment specification. Insist on these being written into the purchase order rather than discussed verbally.

• Site survey and feed-water analysis before the final quotation — never accept a specification produced without a water report.
• Defined commissioning scope: civil and electrical prerequisites, who supplies what, and a documented performance test at handover.
• Written service response times, with escalation, and clarity on whether spares are held locally.
• Operator training and a laminated SOP left on site, so routine flushing and cartridge changes do not depend on one person.
• Warranty terms stated separately for membranes, pumps, vessels and instrumentation, because they differ.