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St. George Home Services

Plumbing · Water treatment

Whole-home carbon and sediment filtration

Carbon and sediment filtration on the main line, so what reaches every fixture has been through something.

One flat fee to find out what is wrong. You are told it on the phone before anyone is dispatched, and it comes off the job if you hire us. Read our Plain Terms

A whole-house filtration and softening system plumbed into the main line on a garage wall
Whole-house filtration and softening. San Pedro, California.

What the work is

A whole-home filter handles sediment and taste and odor compounds at the point where the water enters the house, ahead of the softener and everything else. It is not a softener and does not replace one.

The two questions are flow and service. A filter sized too small drops pressure across the house at peak; one installed without a bypass means the whole house is off every time a cartridge changes. We size for your service and install with a bypass.

What is included

  • The housing and media or cartridges, plumbed on the main line with a bypass
  • Pressure gauges before and after, so you can see when it is loading up
  • Writing down the cartridge sizes and the change interval

What is not

  • Softening. This is filtration; hardness passes straight through
  • Well water treatment, which is a different specification
  • A promise about a specific contaminant unless we have tested for it

Order matters

Sediment and carbon go ahead of a softener so the resin is protected. Reverse osmosis goes last, at the tap. Getting the order wrong shortens the life of the expensive part.

No water quality report in the county publishes hardness; it is not a federally required parameter. St. George blends spring, well and Virgin River sources, and its 2024 report shows total dissolved solids from 118 to 936 ppm and sulfate from 1.38 to 451 ppm depending on which blend feeds your street. A city-wide number is not your number. A recommendation should come from a test at your tap.

What to ask anyone quoting this, us included

  • What flow rate is this rated for, and what is my service?
  • Is there a bypass and are there gauges?
  • What does a cartridge cost and how often?

What we can show you in writing

Every line traces to a document we read in full. The number after a sentence points to the research below.

  • St. George blends Virgin River surface water treated at Quail Creek with spring and well sources. Surface water carries a particulate load that varies through the year, which is what a sediment stage is for. It also protects softener resin and an RO membrane downstream.1
  • St. George disinfects with free chlorine, not chloramine. Standard granular activated carbon handles free chlorine efficiently. A chloramine city needs catalytic carbon and much longer contact time, so a smaller and cheaper carbon bed does the job here.1
  • Order matters: sediment, then carbon, then the softener. Free chlorine degrades softener resin, so carbon ahead of the softener extends the life of the resin.1

Where this comes from

Every line above traces to a document we read in full. The number after a sentence points to the research below; hover it for the section. If you find a line wrong, tell us and we will fix it and say so.

  1. Plumbing research, August 2026 Compiled from manufacturer warranty documents and installation manuals (A.O. Smith, Noritz, Rinnai, Rheem, Navien, Bradford White), the Battelle / Water Quality Research Foundation study, the Utah Code and DOPL rules. 1 section cited. Hover a number above for the section.

Read before you decide

The rest of water treatment

The quote is the number. There is no second number.

Call (435) 850-0053

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