Filter cartridges beside a kitchen faucet filling a glass

Home
Services
Plumbing
Water softeners & filters

Water heaters & water · Spokane and North Idaho

Water softeners & filters in Spokane Valley, WA

Water softeners, whole-house filters, salt-free conditioners and reverse osmosis drinking water, chosen after we look at what is in your water.

4.8★★★★★4,000+ Google reviews

Call 24/7(509) 535-5946

Water treatment prices

Softeners and filters

Starting prices

Under-sink filterFrom $491
Whole-house filterFrom $987
Reverse osmosis, under sinkFrom $1,622
Water softener, 1 inchFrom $3,353

Get a quote

Filter changes from $273. Club members save 10%.

From$491Under-sink filter

From$1,622Reverse osmosis system

From$3,353Water softener, installed

From$273Filter change

What is included

Systems we install.

Water softeners1-inch softeners, with or without a carbon filter, and bypass valves for servicing.
Salt-free conditionersZilmet ActivFlo, Watts OneFlow and Halo systems that control scale without salt.
Whole-house filtersSediment, scale and carbon filters where the water comes into the house.
Reverse osmosisDrinking water systems under the sink or in the basement, with their own faucet.
Point-of-use filtersUnder-counter filters for a single tap.
Filter changesReplacement cartridges and media for the systems we install.

Gold Seal Mechanical box truck parked at a townhome job — On the job across Spokane and North Idaho

Starting prices

Water treatment prices.

Starting prices for systems supplied and installed. Club members pay 10% less.

Your softener, installed: From $2,231
Bypass valves, during service: From $736

Water treatment starting prices · Gold Seal flat-rate book, 2026
Service	What it covers	Starting at
Under-counter filter Atlas Filtri, sediment and scale	Filters the water at one tap.	From$491 Members from $442 Get a quote →
Heavy sediment filter Atlas Filtri Hydra	Catches sand and grit where the water comes in.	From$702 Members from $632 Get a quote →
Whole-house filter 10-inch housing	A standard whole-house filter.	From$987 Members from $888 Get a quote →
Whole-house conditioner Zilmet ActivFlo, 3/4 inch	Salt-free scale control for the whole house.	From$1,278 Members from $1,150 Get a quote →
Reverse osmosis Watts, under sink	Drinking water with its own faucet.	From$1,622 Members from $1,460 Get a quote →
Descaler Watts OneFlow, 3/4 inch	Salt-free scale control, wall mounted.	From$1,635 Members from $1,471 Get a quote →
Sediment and scale filter Atlas Filtri Mono	Whole-house sediment and scale filtration.	From$1,722 Members from $1,550 Get a quote →
Reverse osmosis Atlas Filtri	A reverse osmosis drinking water system.	From$1,798 Members from $1,618 Get a quote →
Sediment, scale and carbon Atlas Filtri Duo	Adds carbon for taste and odor.	From$1,911 Members from $1,720 Get a quote →
Water softener 1 inch, premium	Supplied and installed.	From$3,353 Members from $3,018 Get a quote →
Water softener with carbon 1 inch, premium	A softener with a carbon filter.	From$3,701 Members from $3,331 Get a quote →
Halo 5 conditioner Premium	Whole-house filtration and conditioning.	From$5,015 Members from $4,514 Get a quote →

Which system you need depends on what your water shows, so we look before we recommend one. Member prices are for Quality Service Club members. Starting prices from our 2026 pricebook. A real person confirms your price before anything is scheduled.

Repairs

Filter changes and replacements.

Water softeners & filters · Gold Seal flat-rate book, October 2026
Service	What it covers	Starting at
Under-counter filter change Atlas Filtri	Replace the under-counter cartridge.	From$273 Members from $246 Get a quote →
Hydra filter change Atlas Filtri	Replace the Hydra filter and spring.	From$333 Members from $300 Get a quote →
Eco Pure filter change Eco Pure	Replace the Eco Pure filter.	From$398 Members from $358 Get a quote →
Mono filter change Atlas Filtri	Replace the sediment and scale filter.	From$407 Members from $367 Get a quote →
Reverse osmosis cartridge Watts	Replace the Watts reverse osmosis cartridge.	From$427 Members from $384 Get a quote →
Reverse osmosis filters Atlas Filtri	Replace the reverse osmosis filter set.	From$674 Members from $606 Get a quote →
OneFlow cartridge 3/4 inch	Replace the OneFlow descaler cartridge.	From$780 Members from $702 Get a quote →
Softener replacement 1 inch, premium	Replace an existing softener.	From$2,484 Members from $2,236 Get a quote →

Member prices are for Quality Service Club members. Starting prices from our 2026 pricebook. A real person confirms your price before anything is scheduled.

Know the signs

Signs your water needs treatment.

Each problem has a different fix, which is why we look first.

White scale

Crust on faucets and shower doors, spotted glasses and soap that won’t lather mean hard water.

Short-lived appliances

Scale on heating surfaces shortens the life of water heaters and dishwashers.

Chlorine taste or smell

A carbon filter takes care of taste and odor.

A rotten-egg smell

Only on the hot side? The water heater. On both? The supply. The fixes differ.

How it works

Test. Choose. Install.

We start by looking at your water.

01
Test
We check your water for hardness and the problems you’re seeing.
02
Choose
You pick a system with the prices in front of you.
03
Install
We install it and set it up for how your household uses water.

4.8★★★★★Google · Over 4,000 reviews

Gold Seal Mechanical GOLDSSM799MG · Gold Seal Plumbing GOLDSSP771K6 · Gold Seal Rooter GOLDSSR772LF · Idaho PLB-C-8717

Questions

Water softeners & filters, answered.

Answers from licensed plumbers. Still unsure? Call (509) 535-5946, 24 hours a day.

How much does a water softener cost?

A premium 1-inch water softener starts from $3,353 installed at Gold Seal, or from $3,701 with a carbon filter. Replacing an existing softener starts from $2,484, and installing one you bought from $2,231.

What is the difference between a softener and a filter?

They solve different problems. A softener removes the calcium and magnesium that cause scale. A filter targets something specific: sediment, iron, chlorine, or taste and odor. Many homes need both, and testing the water shows which.

Do I need water treatment on city water?

Sometimes. City water is treated to safe standards but still varies in hardness, chlorine and taste. Many Spokane Valley homes on city water benefit from softening or carbon filtration for scale and taste, not safety.

Is a reverse osmosis system worth it?

For drinking and cooking water, many households think so. Reverse osmosis removes a broad range of dissolved contaminants other filters leave behind, usually at the kitchen sink. An under-sink system starts from $1,622.

How much upkeep does a softener need?

Keep salt in the brine tank and have it checked once a year: the resin, the valve and how often it regenerates. A softener set to regenerate more often than the house needs wastes salt and water.

Membership

What members get.

Priority scheduling for emergencies, 10% off services and materials, no minor diagnostic fee, a yearly plumbing and drain safety inspection and shut-off tags on your main water valve and water heater.

Members vs non-members →

Quality Service Club

Members save

For every home and business we serve

$149first year

Plus tax. Then $95 a year when you renew.

Priority scheduling for emergencies
10% off services and materials
No minor diagnostic fee
A yearly plumbing and drain safety inspection
Shut-off tags on your main water valve and water heater

Join the Quality Service Club Everything it includes →

Related services

The same company handles every pipe on the property, from the water meter to the sewer main.

Hard water? Find out what’s in it.

Water softeners, filters and reverse osmosis across Spokane and North Idaho.

Call 24/7 (509) 535-5946

Get a quote See offers