Podcast Q & A 2: “Can I use a softener to remove iron? I know I have iron problem because we get stains on our fixtures and tub”

Podcast: Play in new window | Download

Note: This podcast transcript has been edited for clarity and length.

Hey! Welcome to the Clean Water Made Easy podcast Q&A, episode 2.
My name is Gerry Bulfin. I’m a WQA-Certified Master Water Specialist and Water Treatment Contractor here in Santa Cruz, California. Each week, we pick one of the many questions we get and answer it here.

Today’s Question

This one is from David:

“Can I use a softener to remove iron? I know I have an iron problem because we get stains on our fixtures and tub. Right now, I have nothing, but my father said he will buy us a water softener. I don’t really think we have hard water, but he says that it will take our iron out, too. What do you think? I was thinking about getting a whole-house water filter from Home Depot, but I don’t like the idea of having to change the filter.”

Initial Answer

Good question, David. Your father might be right—it could work—but it depends on a few factors.

Test Your Water First

• You’ll want to know how much iron is in your water.
• Use a DIY test kit or send it to a lab.
• Softening works better with low levels of iron (below 1 part per million). Above that, staining is common, and softeners struggle.
• Also test the pH. If the pH is high (7.5–8 or more), iron is more likely to oxidize into rust, and the softener won’t work as well.

Clear vs. Rusty Water

• Fill a white 5-gallon bucket from your well.
• If the water is crystal clear, a softener may work better.
• If it’s rusty or discolored, you’ll likely have more trouble.
• Odor and Hardness
• If there’s odor, softeners foul quickly.
• If your water isn’t hard, you may not want a softener just for iron because you’ll still need to deal with salt.

How Softeners Work with Iron

• Softeners remove calcium, magnesium, and iron using resin beads. They substitute sodium for it.
• But if you have too much iron—especially ferric iron—it can clog and foul the resin.
• Sometimes water even comes out worse.
• You can clean resin with rust-removing salt or chemicals, but it’s more work and expense.

When a Softener Might Work

• Neutral or slightly acidic pH (around 7).
• Low iron levels.
• When you also want soft water for hardness removal.

Better Option: Iron Filters

• Most of the time, a backwashing iron filter is the way to go.
• Iron filters use media that trap iron and then automatically backwash once or twice a week.
• No salt, no chemicals, less hassle.

What About Cartridge Filters?

• Whole-house cartridge filters from places like Home Depot aren’t great for dissolved iron.
• Iron passes right through.
• Cartridges can also grow bacteria and cause pressure loss.
• They’re more of a hassle long-term.

Final Notes on Softener Use

• If your water is very acidic (pH 6.5 or lower), don’t use a softener.
• Removing hardness in already acidic water can make it even more corrosive.

Closing

Hope that helps, David.
If anyone else has questions, visit our blog at cleanwaterstore.com/blog. On the right side, click the blue button to send us a voicemail from your phone or computer. Or just call us at 888-600-5426 or email info@cleanwaterstore.com.

Thanks for listening!