Water Quality and Treatment Reference

Why this reference exists

Water quality affects every plumbing job: pipe life, fixture finish, appliance longevity, customer skin + hair, taste, smell. Whole-house water treatment is a solid install ticket + recurring service revenue. This reference covers the working framework for diagnosing water issues + selecting treatment.

Common water quality issues

Water testing

Initial water test:

• 12-parameter standard test: a modest lab fee
• Customer pays for testing
• Lab results in 5-10 business days
• Customer doesn't trust without numbers

Quick on-site tests:

• Iron test strip: similar
• pH meter: an inexpensive handheld meter
• TDS meter: cheaper still than a pH meter

At-home water test kits:

• Customer-mailed kits: several times the cost of the professional lab test (full panel)
• Trust + speed lower than professional

For most service: combine on-site quick tests + lab confirmation for major treatment recommendations.

Hardness measurement

Hardness measured in:

• Grains per gallon (GPG) - U.S. standard
• Parts per million (PPM) calcium carbonate
• 1 GPG = 17.1 PPM

Hardness categories:

• 0-3 GPG: soft
• 3-7 GPG: slightly hard
• 7-10 GPG: moderately hard
• 10-15 GPG: hard
• 15-30 GPG: very hard
• 30+ GPG: extremely hard

Symptoms vary by hardness:

• < 7 GPG: usually no problems
• 7-15 GPG: white deposits, customer complaint
• 15+ GPG: appliance damage, pipe scaling, customer-paid solution

Water softener systems

Ion exchange softener (most common):

• Salt (NaCl) regenerates resin bed
• Exchanges Na+ for Ca2+ + Mg2+
• 50,000-80,000 grain capacity typical
• Regenerates every few days based on water use

Salt-free conditioner:

• Doesn't actually remove hardness; conditions to prevent scaling
• Lower environmental impact
• 5-10 year service life
• Cheaper ongoing (no salt)
• Less effective at extreme hardness

For most customer: ion exchange softener (10-25 GPG hard water).

For low/medium hardness + environmental customer: salt-free conditioner.

For extreme hardness (25+ GPG): ion exchange.

Iron + manganese filters

Air-injection oxidation filter:

• Pump air into water
• Oxidizes iron + manganese
• Filter media captures oxidized particles
• A premium install among filtration options
• Self-cleaning + media-replenishment

Greensand filter (older technology):

• Uses potassium permanganate for oxidation
• Somewhat cheaper to install than air-injection
• More maintenance

Iron tolerance:

• < 0.3 ppm: typically no problem
• 0.3-1.0 ppm: customer notices, treatable

• 1.0 ppm: serious problem; aggressive treatment

Acid neutralizer

For low pH water (acidic):

• pH 5.0-6.5: copper pinholes, blue staining
• Calcite (calcium carbonate) media
• Slow-release calcium adjusts pH up
• Media replenishment every 1-3 years
• Mid-range install cost among treatment options

Common in well water, rural areas.

Reverse osmosis (RO)

Whole-house RO:

• Filters everything; minimal salt + dissolved solids
• The most expensive RO tier to install + maintain the annual filter on
• Wastes 3-5 gallons water per 1 gallon produced
• Premium installation

Under-sink RO:

• Just drinking water
• A small fraction of the whole-house RO install cost, with a cheaper annual filter too
• Most popular RO format

For most: under-sink RO at kitchen sink + whole-house softener separately.

UV sterilizer

For bacterial water:

• UV lamp in housing
• Water passes through UV exposure
• Bacteria DNA damaged; can't reproduce
• Mid-range install cost
• Modest annual bulb replacement cost

Required pre-treatment:

• Sediment filter (so bacteria not shielded by debris)
• Sometimes softener (hard water builds scale on UV lamp)

Common for: well water, recent boil-water advisory areas, customer-driven safety.

Carbon filter

For chlorine + taste:

• Activated carbon adsorbs chlorine + chemicals
• One of the cheaper whole-house treatment installs
• Modest annual cartridge replacement cost
• 2-5 year filter media replacement (whole-house)

City water customers often want this; chlorinated water tastes strong + dries skin.

Sediment filter (point-of-entry)

For visible particulates:

• Spin-down filter (washable)
• Cartridge filter (replaceable)
• The cheapest point-of-entry install on this list
• Low per-cartridge cost (3-6 month replacement)

Universal recommendation for well water + areas with old supply pipe.

Treatment order (for combination)

When water needs multiple treatments, order matters:

1. Sediment filter (first; protects downstream from particulate damage)
2. Iron/Manganese filter (if needed)
3. Acid neutralizer (if needed)
4. Water softener (treats post-corrected pH)
5. Carbon filter (post-softener, removes chlorine)
6. UV sterilizer (last; treats clearest water)
7. RO at drinking-water fixtures (under sink)

Some installations bypass certain steps. Custom per water test.

Service contract opportunity

Water treatment customers benefit from:

• Annual sediment filter change
• Annual softener salt check + maintenance
• Annual RO filter change
• Annual UV bulb replacement
• Modest per-visit fee, 1-2x/year

100 customers on service adds up to a substantial recurring revenue stream.

Common pitfalls

• No water test: guessing; mediocre results
• Wrong sequence: iron filter after softener = iron precipitates inside softener
• Undersized softener: regenerates daily; salt cost high
• Oversized softener: rarely regenerates; bacterial growth in resin
• No bypass valve: any treatment failure = no water in house
• No customer education: customer doesn't refill salt; softener fails silently
• UV lamp without sediment pre-filter: bacteria shielded by particulates

Customer talking points

For initial consultation:

1. "Water test reveals what's actually in your water."
2. "Results recommend: [specific treatments]"
3. "Cost: $X. Each treatment lasts 7-15+ years."
4. "Recurring service: $Y/year"

For specific concerns:

• Iron staining customer: "Iron at [X ppm], treatment [Y], $Z install"
• Hard water customer: "[X GPG], softener [Y], $Z install"
• Concerned about safety: "RO at kitchen + whole-house options"

When customer can't afford whole-house

Phased approach:

1. Year 1: under-sink RO (the lowest-cost entry point) for drinking water
2. Year 2: water softener (a bigger-ticket add) if hard water
3. Year 3: comprehensive system or other treatments

Customer can grow into full treatment over years.

IRA + utility incentives

Water treatment generally NOT eligible for federal credit. Some utility rebates exist:

• California Drought Tolerance programs
• Some state water conservation rebates

Verify per state.

References

• WQA (Water Quality Association) certification + standards
• EPA Safe Drinking Water Act
• NSF/ANSI standards (42, 44, 53, 55, 58, 62, 401)
• ASSE plumbing standards
• Manufacturer manuals (Culligan, Kinetico, Watts, Pelican, Aquasana)
• Manuall internal: Well Water Systems Reference, Annual Whole-Home Plumbing Inspection