Water problem in karachi. RO water system help

[nfssaad]

700 for general usage...

the minerals will be added at drinking point only...

[nfssaad]

In Karachi - Saddar area at the regal bus stop REGAL Shopping centre there are 5 different shops selling WATER RO & Filtering solutions, & their consumables. They open at 10 am and parking is available till 11.30 am afterwards the area is chaotic for vehicle parking.

got a complete 4 stage mini-RO plant for Rs. 75000 - process approx 150 litres per hour, I will ask the user if he is comfortable to share the pictures. it is installed at a dairy farm near toll plaza opposite Rangers compound at super highway.

please ask the user for update...
also what was his feed water tds..

can you describe the individual components that you used. specially pressure pump and control system. Which RO membrane etc..

[whiteangel]

brother - i have similar problem - well water damaging all the sanitary fittings seriously plus accumulation of 'bhalo mitti' in the tanks - i am confused about RO SYSTEM - is it really helpful for getting safe drinking water for the house - are right knowledgeable persons available to provide a cost effective system?? please help . Thanks - salim from karachi.

The white stuff on your sanitary fittings is limescale deposits, which basically means the water is hard (high mineral deposits) Limescale will clog valves and ruin chrome.

First you need a sediment filter followed by polypropylene filters which will get rid of all the visible impurities in water. The next step is RO unit which will bring down the TDS (total dissolved solids) to 20ppm (parts per million). But a whole house filtration unit is going to be expensive. If you want to keep sanitary fittings clean without investing in an RO unit, you can try getting a water softner, it is less expensive, but it is only for dealing with hard water deposits, it won't give you clean drinking water.

If you want to keep sanitary fittings clean without investing in an RO or water softener, you need to wipe them with a towel after using them. If you don't wipe them regularly, water deposits will form on them which will harden and destroy the chrome. To clean sanitary fittings with limescale on them, put some harpic on a towel and wipe it on the fittings, it will eat away the limescale.

[msalimsabir]

The white stuff on your sanitary fittings is limescale deposits, which basically means the water is hard (high mineral deposits) Limescale will clog valves and ruin chrome.

First you need a sediment filter followed by polypropylene filters which will get rid of all the visible impurities in water. The next step is RO unit which will bring down the TDS (total dissolved solids) to 20ppm (parts per million). But a whole house filtration unit is going to be expensive. If you want to keep sanitary fittings clean without investing in an RO unit, you can try getting a water softner, it is less expensive, but it is only for dealing with hard water deposits, it won't give you clean drinking water.

If you want to keep sanitary fittings clean without investing in an RO or water softener, you need to wipe them with a towel after using them. If you don't wipe them regularly, water deposits will form on them which will harden and destroy the chrome. To clean sanitary fittings with limescale on them, put some harpic on a towel and wipe it on the fittings, it will eat away the limescale.

Thanks for details!
What will be approx. cost of SOFTNER?
Also any experience about roplant.pk?

[whiteangel]

Hatimi water tech at hyderi. I was looking at whole house filteration but its way too expensive. Regarding why use well water is because of no water supply from kwsb for past 7 months. Using tanker. I wanted a quick fix for drinking water for time being. The unit I have has a sediment filter, carbon block, activated carbon, ro, post ro activated carbon filter. The only thing that brings down tds is ro membrane and deionizing cartridge

6000 to 7000 TDS is astronomical! Tap water in my home is about 350-500 TDS after RO it comes down to 15-20 TDS. I will need to talk to my Multiply contact and see what he suggests. I can't think of anything else that could bring down the TDS of feed water. with that much TDS your RO membrane is going to need frequent replacement. May be once every 3 or 4 months. My RO membrane lasted more than 4 years and it was still ok, but I replaced it anyway.

[nfssaad]

6000 to 7000 TDS is astronomical! Tap water in my home is about 350-500 TDS after RO it comes down to 15-20 TDS. I will need to talk to my Multiply contact and see what he suggests. I can't think of anything else that could bring down the TDS of feed water. with that much TDS your RO membrane is going to need frequent replacement. May be once every 3 or 4 months. My RO membrane lasted more than 4 years and it was still ok, but I replaced it anyway.

if this unit can be returned.. i will invest in a bigger unit then... or buy components my self and build it.. small steps at a time...

the unit is still packed. ro membrane and cartridges still sealed pack.

6000-7000 is OK for brackish water above that is plain sea water....its well water after all.

[nfssaad]

brother - i have similar problem - well water damaging all the sanitary fittings seriously plus accumulation of 'bhalo mitti' in the tanks - i am confused about RO SYSTEM - is it really helpful for getting safe drinking water for the house - are right knowledgeable persons available to provide a cost effective system?? please help . Thanks - salim from karachi.

we had a complete different plumbing system installed for well water.. all pvc plastic items...no corrosion..

[msalimsabir]

bro, first step ! i am going to test the well water. can you pl guide me what needs to be tested except TDS plus from which authentic lab in karachi?? thanks

[whiteangel]

if this unit can be returned.. i will invest in a bigger unit then... or buy components my self and build it.. small steps at a time...

the unit is still packed. ro membrane and cartridges still sealed pack.

6000-7000 is OK for brackish water above that is plain sea water....its well water after all.

I talked to the Multiply main distributor, he says he needs to see a water test report before he can recommend an RO system for the house. Do you have a test report?

[nfssaad]

I talked to the Multiply main distributor, he says he needs to see a water test report before he can recommend an RO system for the house. Do you have a test report?

i am trying to contact sgs for this report...

the people selling ro plants just have a simple tds meter with which they measure the tds.. not much help..

[msalimsabir]

bro, first step ! i am going to test the well water. can you pl guide me what needs to be tested except TDS plus from which authentic lab in karachi?? thanks

[nfssaad]

bro, first step ! i am going to test the well water. can you pl guide me what needs to be tested except TDS plus from which authentic lab in karachi?? thanks

simple tds test can be done at home if you have a small kitchen weight scale...search tds gravimetric test on google

tds meter in market are not accurate. they are actually conductivity meters.. only give approximate tds

i contacted SGS... they gave me a massively high quote for a very thorough test.

[nfssaad]

sgs gave me a quote of a whopping 36000 for a complete microbiological and phsyio chemical test

[pwuser151114045055]

Send contect details cmsin111@gmail.com

[pwuser151915190748]

dear brother
Assalamoalaikom
The simplest way to check TDS is by mean of a conductivity meter and multiply the conductivity reading in microcimens by 0.7 will give you a rough estimation of TDS in mg/ltr
The selection of RO system depends on the TDS. you have got different RO membrane for the tap water, for brakish water and in extreame case the sea water having a TDS of +35000 mg/ltr. As the TDS rises so does the osmotic pressure and hence the feed pressure or over pressure applied to overcome the osmotic pressure which drives water from concentrated side to less concentrated side across the membrane. The membranes are supposed to be water permeable or in simple words they let the water molecules pass through them and stop other dissolved ion to from permeating or passing through it.
The main things to be considered are the SDI silt density index which should not be more than 3-5, the chlorine under no circumstances should be allowed to pass and are effectively checked by carbon filter and anti scalant should be dosed to avoid calcite deposition over membrane surface. Note the initial values such as permeate or product flow rate , salt rejection,salt passage as reference values and after one or two months of operation note operational values and an expert may be consulted to calculate the normalized values to check how far the standard or reference value has deviated eg a 10 - 15 % deviation needs an immediate acid and alkaline cleaning . This is how your membrane or membranes are expected last more or less ten years!!

[pwuser151915190748]

Dear brothers
Assalamoalaikom
I invite the people who need any information regarding RO selection or operation
for their brackish water well may feel free to contact me on my e-mail ejazuh86@gmail.com

[roplant]

Hello to All we are pioneer in RO Plant Pakistan . Please if any one need RO Plant for home or commercial use please contact us 03000777366.

[pwuser151069008118]

Your city?

[digitalmacco]

Size: 700 L/day = ~185 gallons/day, so pick an RO train rated a bit above that (a 200–300 GPD membrane or a small 300–500 GPD skid gives safe margin).

Must-have components (buy individually — common in local market & online):

Sediment prefilter (multistage)

Carbon (chlorine) prefilter

Antiscalant / softening step if hardness or high TDS (brackish)

High-pressure RO membrane + pressure vessel

Flow restrictor / concentrate flush arrangement

Post-carbon + remineralization filter (you must add this after RO)

UV (optional/extra safety)

Booster/high-pressure pump if feed pressure is low.

Pressure note (important): brackish RO needs substantial feed pressure (typical range for fresh/brackish: ~2–17 bar / 30–250 psi); if your well/suction pump can’t supply that, add a booster pump. Check pump working pressure vs membrane requirement.

Installation / plumbing: you can pump into your overhead tank — ensure tank is food-grade, has venting, and install non-return valve and float control to stop overflow.

Where to buy: local water-treatment shops, online marketplaces, and classifieds sell all individual parts (membranes, housings, booster pumps, filters). Prices vary — small booster pumps seen around ~₨6k–8k, and complete small commercial/domestic skids listed online (use those ads to gauge total cost).

Quick checklist before buying: measure TDS & hardness; confirm required membrane pressure; choose membrane GPD ≥ your need; add remineralizer; budget for periodic consumables (prefilters, membrane replacement, annual service).