Rispri LabsENGINEERING A CIRCULAR FUTURE

SALTY WATER, RO AND MEMBRANES / 02

Ready: level 9 of 9Already in useVillage or hospital

Solar-powered salt removal that keeps minerals.
Desalting water with sunlight, and keeping the minerals.

The water is salty, but RO removes all the good minerals and wastes too much water. Instead of pushing water through a membrane, a small electric current pulls the salt out of the water.

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SALTY WATER, RO PLANTS AND MEMBRANESDelivered by Rispri Labs
Salty water, RO plants and membranes
Salty water, RO plants and membranes

What it achieves

The key numbers.

500 to 1,000 L/h

of drinking water.

Under 5 paise

per litre to desalt.

Solar

powered.

Problem and fix

The problem this solves.

  1. 01
    The problem

    The water is salty, but RO removes all the good minerals and wastes too much water.

    How it is fixed

    Instead of pushing water through a membrane, a small electric current pulls the salt out of the water. It runs on solar panels and leaves healthy minerals in.

How it works

Step by step.

  1. 1

    Feed

    Salty water flows between special membranes.

  2. 2

    Pull

    A small electric current from solar panels pulls salt out.

  3. 3

    Balance

    Some healthy minerals are left in on purpose.

  4. 4

    Report

    Sensors send water quality readings online.

Key features

Why it works well.

500 to 1,000 litres an hour. Sends water quality readings online.

  • Less waste than ROMore of the water becomes drinking water.
  • Healthy mineralsWater is not stripped bare.
  • Off-gridRuns on solar power.
  • Membranes made in IndiaSpares are easier to get.

At a glance

The details.

Output500 to 1,000 litres an hour
RemovesSalt
PowerSolar
Running costUnder 5 paise a litre
Ready levelLevel 9 of 9 (already in use)
ScaleVillage or hospital

Costs are indicative and change with your water, site and plant size. We confirm them after testing a sample.

Where it is used

Who it is for.

  • Villages with salty groundwater
  • Hospitals
  • Desert and coastal areas

Questions

Frequently asked questions.

Is this technology proven?

Yes. It is at ready level 9 of 9, which means: already in use. 500 to 1,000 litres an hour. Sends water quality readings online.

What does it cost to run?

About under 5 paise a litre. The exact figure depends on your water and the size of the plant. We confirm it after testing a sample.

Can we try it on our own water first?

Yes. We test a sample in our NABL-accredited lab and, where it helps, run a small trial on your site before you invest in a full plant.

Do you supply and install it?

Yes. We design, supply, install and start up the system, train your staff, and our lab checks the treated water.

Salty water, RO plants and membranes

Ready: level 7 of 9Small RO and NF plants that waste lessThe water is salty and may also have fluoride, arsenic or nitrate.Ready: level 7 to 9 of 9UF plant that wastes almost no waterThe water is not salty but has germs or mud. An RO plant would only waste water here.Ready: level 6 to 9 of 9RO membranes made in IndiaPlants wait weeks for imported RO membranes when one fails.Problem guideWhy Village RO Plants Stop Working, and What Works BetterMany villages do not need RO at all. Where they do, the plant needs someone watching it.

THE NEXT STEP

Fix it on
your own site.

Send us a water sample or a test report. We will check it, confirm this method fits and tell you what it costs to run.

Discuss your problem
THIS SEGMENTSalty water, RO and membranesALL TECHNOLOGIESAll proven technologies