Hot Topic: Sodium testing

Jan. 1, 2013


Posted By scottharper on 10/17/2012 at 4:38:57 PM

I recently took a sample of water from a private well to a local lab for testing. I asked for a sodium test and they also tested chloride. The customer said they are having corrosion on fixtures.

The current treatment is a chlorinator and a carbon filter with backwash valve. There is no softener being used.

They are near a river and some wells nearby do have salt intrusion.

The results were:

  • Chloride – 632 ppm
  • Sodium – 347 ppm
  • Hardness – 15 gpg
  • pH – 8.0.

Would it require a whole-house reverse osmosis to remove this sodium to prevent corrosion? What would be the general required components involved, i.e. reservoir tank, reboost pump, etc?  


Allen Hurtado: 10/18/2012 12:52:09 PM

Scott, The sodium in this water is inert from a corrosion standpoint, but the elevated chloride concentration is an issue.

Before anyone can design a system for you, a full water analysis is needed. You should also specify delivery flow rate in gpm and water production required in gpd.

The classic and likeliest technology for the chloride reduction is reverse osmosis. This will require:

1. Pre-treatment required per the aforementioned water analysis.

2. Storage and repumping of the produced water.

3. Post-treatment required per the desired finished water quality.

4. Interconnecting piping and controls.

Mechanical construction, plumbing and power and controls wiring are typically required. These systems for residential use are really like small-scale industrial applications.

If this type of integrated system installation is new to you, I’d recommend working with an experienced water treatment contractor.

robyoung: 11/19/2012 4:50:35 PM

Would desalination help this customer out? We have installed a few with no pretreatment and they work great.

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