Express Water Anti-Scale WH300SCPS

Last updated: November 9, 2026

Express Water Anti-Scale WH300SCPS
2.4/5#16 of 20 in cartridge whole-house filters
2.4

For hard city water where scale on the water heater is the main worry but a softener is too much. It doesn’t soften.

  • $1.84 per 1,000 galRunning cost
  • 100,000 gallonsCapacity
  • 15 gpmFlow
Check price at Amazon$503.12

Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • A polyphosphate stage slows scale on water heaters and fixtures without salt
  • Pressure gauges show when the filters are clogging
  • Steel frame holds the housings, so the install is tidy
Cons
  • Polyphosphate only slows scale; it doesn’t soften the water
  • Its certification claim names no standard and is not in a registry
  • The three filter set costs about $185

The Express Water Deluxe 3-Stage family

Every Express Water Deluxe 3-Stage model we rank, smallest first. Ratings compare each against its own build.

ModelRunning costRatingPrice
Express Water Ultimate Protection WH300SCKP$1.78 per 1,000 gal2.4/5$443.14
Express Water Heavy Metal WH300SCKS$1.99 per 1,000 gal2.4/5$499.99
Express Water Anti-Scale WH300SCPS (this one)$1.84 per 1,000 gal2.4/5$503.12

How it scores

The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its build. How we rank explains each one.

Specifications

Model numberWH300SCPS
Filtration
Capacity100,000 gallons
Replacement filters or media$183.67
Running cost$1.84 per 1,000 gal
Stages3
ChloramineNo
PFASNo
Build
Flow15 gpm
Ports1 in
UV stageNo
Warranty1 year

Alternatives in this build

GE GXWH60T

A cheap big housing for sediment and chlorine taste on city water. Filter costs add up because each one lasts only three months.

Amazon $99
$99
$3.40 per 1,000 gal15,000 gal

Compare

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