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Water treatment & RO plant

Enter the treated water you need and what is in the feed. The list below is what that implies — sand and carbon filters, dosing, membranes and vessels, the high pressure pump, and storage — with a rate column you fill in yourself.

How this works →

Your figures

Permeate required(m³/hour)

Treated water out, not raw water in.

Operating hours(hours/day)

Sized on running hours; the balance is backwash and CIP.

Feed TDS(mg/litre)

Brackish water up to about 10,000. Above that the pressures and the membranes change.

Recovery(%)

Permeate as a share of feed. The rest leaves as reject.

Treated water storage(hours)

Material take-off

What to buy, at what size, and how many — worked out from the figures above.

Rates

CurrencyFabricated steel (₨/kg)Skilled labour (₨/day)

Every line is estimated from those two figures: its steel — or steel-equivalent — mass at the steel rate, stainless at 3.2×, plus its install days at the labour rate. There is no price feed behind this, so the two anchors are seeded from typical Pakistan figures as of September 2026 and are yours to correct. Type over any individual rate and yours is used instead.

Pre-treatment

Material	Size	No.	Total weight	Rate	Amount
Raw water tank, MS epoxy linedTwo hours of feed, so the plant rides out a supply interruptionRate from 4,718 kg + 5 days labour — Tank with lining, level and overflow	75 m³3.9 t each	1tank	3.9t	estimated	1,899,829
Multigrade sand filter, FRPTurbidity and suspended solids out before the membranesRate from 1,136 kg + 3 days labour — FRP vessel, media, valves and piping	35.7 m³/h	2vessel	—	estimated	923,572
Activated carbon filter, FRPChlorine out — it destroys a polyamide membrane in hoursRate from 1,237 kg + 3 days labour — FRP vessel, carbon, valves and piping	35.7 m³/h	2vessel	—	estimated	1,004,714
Antiscalant and SMBS dosing skidsScale control and residual chlorine quenchRate from 260 kg + 2 days labour — Tank, metering pump, and calibration column	0.007 m³/h	2skid	—	estimated	218,000
5 micron cartridge filter housingThe last guard before the high-pressure pumpRate from 501 kg stainless-equivalent + 1 day labour — SS housing and cartridges	35.7 m³/h	1housing	—	estimated	644,329

Raw water tank, MS epoxy lined
Two hours of feed, so the plant rides out a supply interruption
Rate from 4,718 kg + 5 days labour — Tank with lining, level and overflow
Size
75 m³ · 3.9 t each
No.
1tank
Total weight
3.9 t
Rate(estimated)
Amount
₨ 1,899,829
Multigrade sand filter, FRP
Turbidity and suspended solids out before the membranes
Rate from 1,136 kg + 3 days labour — FRP vessel, media, valves and piping
Size
35.7 m³/h
No.
2vessel
Total weight
—
Rate(estimated)
Amount
₨ 923,572
Activated carbon filter, FRP
Chlorine out — it destroys a polyamide membrane in hours
Rate from 1,237 kg + 3 days labour — FRP vessel, carbon, valves and piping
Size
35.7 m³/h
No.
2vessel
Total weight
—
Rate(estimated)
Amount
₨ 1,004,714
Antiscalant and SMBS dosing skids
Scale control and residual chlorine quench
Rate from 260 kg + 2 days labour — Tank, metering pump, and calibration column
Size
0.007 m³/h
No.
2skid
Total weight
—
Rate(estimated)
Amount
₨ 218,000
5 micron cartridge filter housing
The last guard before the high-pressure pump
Rate from 501 kg stainless-equivalent + 1 day labour — SS housing and cartridges
Size
35.7 m³/h
No.
1housing
Total weight
—
Rate(estimated)
Amount
₨ 644,329

Reverse osmosis

Material	Size	No.	Total weight	Rate	Amount
High pressure pump, SS 316Duty and standby — the plant stops without itRate from 1,589 kg stainless-equivalent + 3 days labour — Multistage pump, motor, VFD and baseplate	35.7 m³/h at 15 bar	2pump	—	estimated	4,083,206
Membrane pressure vessel, FRP, 6-element34 elements at 37 m² each, six to a vesselRate from 260 kg + 1.5 days labour — FRP vessel, end caps and interconnectors	8040, 6 vessels	6vessel	—	estimated	646,500
RO membrane element, 804020 litres per m² per hour at 1,500 mg/l feedRate from 120 kg + 0.1 days labour — Spiral-wound polyamide element	1,250 m² total	34element	—	estimated	1,640,500
RO skid, frame, instruments and panelFlow, pressure and conductivity on feed, permeate and rejectRate from 2,400 kg stainless-equivalent + 10 days labour — SS frame, high-pressure piping, instruments and PLC	25 m³/h permeate	1skid	—	estimated	3,097,000
Membrane CIP systemAcid and alkali cleaning when the pressure drop risesRate from 840 kg stainless-equivalent + 4 days labour — Tank, heater, pump, filter and hoses	4 m³	1system	—	estimated	1,085,200

High pressure pump, SS 316
Duty and standby — the plant stops without it
Rate from 1,589 kg stainless-equivalent + 3 days labour — Multistage pump, motor, VFD and baseplate
Size
35.7 m³/h at 15 bar
No.
2pump
Total weight
—
Rate(estimated)
Amount
₨ 4,083,206
Membrane pressure vessel, FRP, 6-element
34 elements at 37 m² each, six to a vessel
Rate from 260 kg + 1.5 days labour — FRP vessel, end caps and interconnectors
Size
8040, 6 vessels
No.
6vessel
Total weight
—
Rate(estimated)
Amount
₨ 646,500
RO membrane element, 8040
20 litres per m² per hour at 1,500 mg/l feed
Rate from 120 kg + 0.1 days labour — Spiral-wound polyamide element
Size
1,250 m² total
No.
34element
Total weight
—
Rate(estimated)
Amount
₨ 1,640,500
RO skid, frame, instruments and panel
Flow, pressure and conductivity on feed, permeate and reject
Rate from 2,400 kg stainless-equivalent + 10 days labour — SS frame, high-pressure piping, instruments and PLC
Size
25 m³/h permeate
No.
1skid
Total weight
—
Rate(estimated)
Amount
₨ 3,097,000
Membrane CIP system
Acid and alkali cleaning when the pressure drop rises
Rate from 840 kg stainless-equivalent + 4 days labour — Tank, heater, pump, filter and hoses
Size
4 m³
No.
1system
Total weight
—
Rate(estimated)
Amount
₨ 1,085,200

Post-treatment & storage

Material	Size	No.	Total weight	Rate	Amount
UV steriliserFinal disinfection on the permeateRate from 240 kg stainless-equivalent + 1 day labour — SS chamber, lamps and controller	25 m³/h	1unit	—	estimated	309,700
Remineralisation and pH correctionRO permeate is aggressive and flat — it needs hardness back for drinkingRate from 650 kg + 3 days labour — Calcite contactor, dosing and mixer	25 m³/h	1set	—	estimated	267,500
Treated water tank, MS lined8 hours of permeate, over 2 tanksRate from 5,716 kg + 5 days labour — Tank with food-grade lining, level and vent filter	100 m³4.8 t each	2tank	9.5t	estimated	4,597,672
Distribution pump set with hydro-pneumatic vesselPeak draw is above the average production rateRate from 1,098 kg stainless-equivalent + 2 days labour — Pump, motor, vessel and controls	37.5 m³/h	2pump	—	estimated	2,820,880
Reject handling and discharge line30% of feed leaves as reject — it has to go somewhere legalRate from 601 kg + 3 days labour — Sump, pump, flow meter and line	10.7 m³/h	1set	—	estimated	248,071

UV steriliser
Final disinfection on the permeate
Rate from 240 kg stainless-equivalent + 1 day labour — SS chamber, lamps and controller
Size
25 m³/h
No.
1unit
Total weight
—
Rate(estimated)
Amount
₨ 309,700
Remineralisation and pH correction
RO permeate is aggressive and flat — it needs hardness back for drinking
Rate from 650 kg + 3 days labour — Calcite contactor, dosing and mixer
Size
25 m³/h
No.
1set
Total weight
—
Rate(estimated)
Amount
₨ 267,500
Treated water tank, MS lined
8 hours of permeate, over 2 tanks
Rate from 5,716 kg + 5 days labour — Tank with food-grade lining, level and vent filter
Size
100 m³ · 4.8 t each
No.
2tank
Total weight
9.5 t
Rate(estimated)
Amount
₨ 4,597,672
Distribution pump set with hydro-pneumatic vessel
Peak draw is above the average production rate
Rate from 1,098 kg stainless-equivalent + 2 days labour — Pump, motor, vessel and controls
Size
37.5 m³/h
No.
2pump
Total weight
—
Rate(estimated)
Amount
₨ 2,820,880
Reject handling and discharge line
30% of feed leaves as reject — it has to go somewhere legal
Rate from 601 kg + 3 days labour — Sump, pump, flow meter and line
Size
10.7 m³/h
No.
1set
Total weight
—
Rate(estimated)
Amount
₨ 248,071

Material

₨ 23,298,171

13.5 t of steel to fabricate

Labour

₨ 188,500

75 days at ₨ 2,500 a day

Quotation total

₨ 23,486,673PKR

15 of 15 lines priced

13.46 t is fabricated steel only. 13 bought-in lines — pumps, machines, proprietary units — are priced but carry no steel weight of ours, and show a dash in the weight column.

Questions

How is the membrane count worked out?

From flux — how many litres each square metre of membrane passes per hour. Brackish water runs around twenty, falling as the feed gets saltier, because a dirtier feed has to be pushed harder and fouls faster. The area divided by thirty-seven gives the number of 8040 elements, six to a pressure vessel.

Why does recovery matter?

It sets how much raw water you have to pump and treat for a given output, and how much reject you have to dispose of. At seventy percent recovery, every cubic metre of permeate needs one point four of feed — and the remaining zero point four leaves as concentrate that has to go somewhere legal.

Why is the carbon filter essential?

Because chlorine destroys a polyamide membrane in hours, not months. The carbon filter and the bisulphite dosing are the two things standing between a chlorinated supply and a very expensive replacement.

What is not included?

The bore well or raw supply, civil work and the plant room, the electrical supply, effluent or brine disposal beyond the discharge line, and any specialist post-treatment such as ozonation or bottling.