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Dual Media · Tannins & Hardness

Hardness and tannins, in one tank.

Yellow water and hard water from the same well? A dual media system blends softening resin and tannin resin in one 12×54 tank on the same Clack WS1 valve as our softeners, so both come out in one pass with one brine tank. We put an Iron Breaker ahead of it where the test shows iron, and test the treated water’s pH before we leave.

Tannins: tea-colored well water in a glass

In short

What it is
Natural organic matter from decaying leaves and peat, dissolved in the water the well draws through. Not a health hazard; it is the same thing that colors a cup of tea.
What it does to the house
Yellow or tea-colored water that gets worse after heavy rain, yellow laundry, a musty or earthy taste. A softener and an iron filter both pass it straight through.
What fixes it
A tannin filter: anion exchange resin on the same valve and salt as a softener, or a dual media system that softens and removes tannins in one tank. We test the treated water afterward and add a calcite pH neutralizer only if the pH drops below 7.2.

Is this your water?

Hardness is a positive ion and tannins are negatively charged organic acids, so no single resin captures both. A blended bed holds both kinds: cation resin for the calcium and magnesium, strong-base anion resin for the tannins, regenerated together with ordinary softener salt. The anion resin needs rinsing every few days or it fouls, so the valve runs metered with a day override, and it needs iron kept away from it, which is the Iron Breaker’s job.

Tannins, explained →

What we install

Dual Media System

The science sheet says what a fix has to do. This is how ours does it, for hardness and tannins together

2 in 1
softening and tannin resin blended in a 12×54 tank
Day override
metered, never more than a few days between rinses
< 7.2
treated pH where we add the calcite neutralizer
5 / 10 yr
valve / tank warranty
  • Two resins, one tank. A blended bed of cation (softening) and strong-base anion (tannin) resin in a 12×54 tank: hardness and tannins come out in one pass, with one valve, one brine tank and one footprint.
  • Metered, with a day override. The Clack WS1 counts gallons and regenerates when the bed is spent, but never lets more than a few days pass, because anion resin left loaded with tannins fouls.
  • An Iron Breaker ahead of it, almost always. Iron fouls both resins and takes the tannin capacity first. Where the test shows iron, the Iron Breaker goes in first.
  • Tested for pH after start-up. Removing tannins strips alkalinity and can drop the pH. We test the treated water and add the calcite pH neutralizer only if it falls below 7.2.
  • Sized from your numbers. Hardness, tannin, alkalinity, pH and iron set the resin blend and the regeneration schedule. Heavy tannins or heavy hardness get two tanks instead.

What's included

The in-home test (tannins, alkalinity, pH, hardness, iron), a system sized to it, installation with a bypass, start-up and programming, the first salt load, a walkthrough, and a before-and-after result in writing, pH included.

What you'll notice

Clear water in a white tub and soft water at every tap within a day: soap lathers, glasses rinse clear, laundry whitens over a few washes, and no new scale forms. The musty taste goes with the color.

When we recommend it

Tannins and hardness together, with room or budget for one unit. When either number is heavy, separate tanks give more capacity and longer resin life, and we will tell you so.

Built to be serviced

The same Clack WS1 valve and standard tank as our softeners: parts any technician can maintain for decades, installed by the person who will be here to do it.

How it works

  • Salt. Same brine tank and salt as a softener: keep it at least a third full of pellet or solar salt. It regenerates more often than a plain softener, so it uses more salt; we deliver and load it if you'd rather not.
  • Regeneration. Runs at 2 AM, takes about an hour, and sends a little tea-colored water to the drain. The day override runs it after a quiet stretch, even if you were away.
  • Service. An annual check-up with hardness, color and pH tests at the tap; if a pH neutralizer is fitted, we top it up on the same visit. Salt delivery on a schedule.
SeriesCharger Matrix
Control valveClack WS1, metered, day override
MediaBlended cation and anion resin
Tank12×54 in.
RemovesHardness and tannins
Brine tank15×17×35 in., 240 lbs of salt
pH correctionCalcite neutralizer if pH < 7.2
Plumbing3/4" or 1" connection
Warranty5 years valve • 10 years tank

What happens after you call

  1. 1Brian calls you back.Usually within one business day and we pick a day and time that works for you.
  2. 2We test your water at your house.Hardness, iron, pH, TDS and anything else your symptoms point to.
  3. 3You get a plain-English explanation and a real price.No pressure, no "manager approval" games.

After the install

  • Salt delivery, loaded into the brine tank on a schedule that fits your household.
  • Check-ups and filter changes, tracked and scheduled for you.
  • Service and repair by the person who installed it. Clack WS1 valves are the most widely serviced residential platform in the industry.

Installed in Portage, Kalamazoo, Vicksburg, Schoolcraft, Mattawan, Paw Paw and across Southwest Michigan.

Questions we get at the kitchen table

When is one tank the right answer, and when is it two?

One tank when tannins and hardness are both moderate and there is room or budget for one unit. When either number is heavy, or the water is complicated in other ways, a separate softener and tannin filter give more capacity and longer resin life. We say which from your test, and why.

Why does it regenerate more often than a plain softener?

Anion resin that sits loaded with tannins fouls and stops letting go of them, so the Clack WS1 runs metered with a day override: it regenerates on gallons used, but never lets more than a few days pass. That means more salt than a softener alone, and we say so up front. Salt delivery covers it if you would rather not haul bags.

Do I need the Iron Breaker too?

If your test shows iron, yes. Iron fouls both resins and takes the tannin capacity first, so the Iron Breaker goes in ahead of the dual media tank and the resin lasts. If there is no iron, there is no Iron Breaker.

Will it make my water acidic?

It can. The anion resin strips alkalinity along with the tannins, which lowers pH. We test the treated water at start-up; if it falls below 7.2, a calcite pH neutralizer goes in behind it. If it holds, you do not pay for one.

Is it the same salt as a softener?

Yes. The same 15×17×35 brine tank and ordinary pellet or solar salt, on the same Clack WS1 valve, serviced the same way.

What’s the warranty?

5 years on the Clack WS1 valve and 10 years on the tank, the same as our softeners.

Start with the free water test

We test hardness, iron, pH and TDS at your house and tell you what, if anything, your water needs.

Schedule a free water test

Or call (269) 262-1399

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