St. George Home Services
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Plumbing · Water treatment

RO filter replacement

Replacing the cartridges and the membrane on an under-sink system, whoever installed it.

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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

What the work is

Cartridges load up and stop working; a membrane fouls and its rejection rate falls. Neither failure is visible from the outside, which is why systems quietly stop doing anything years before anyone notices.

We measure the total dissolved solids before and after the change and tell you both numbers. That is the only way to know whether the unit is working.

What is included

  • Sediment and carbon cartridges replaced
  • Membrane replaced where the measurement says it should be
  • Sanitising the housings
  • TDS in and out, before and after, in writing

What is not

  • Proprietary cartridges we cannot source. We will tell you before we book
  • Repairing a leaking system beyond replacing the seals in the housings

Why the interval is not a sticker

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.

A system on a high-TDS blend loads its cartridges faster than the same system on the other side of town. Measure rather than follow the calendar on the box.

What to ask anyone quoting this, us included

  • What was the TDS in and out before you changed anything?
  • And after?
  • When should I next have this done, and why then?

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.

  • The City of St. George's Water Distribution Division instructs residents to set water softeners to 18 grains per gallon, with a maximum of 22 grains.1
  • An RO membrane fed unsoftened water at this hardness will not last. Softened feed water is what buys you the 2 to 3 years.2

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. Environment, water and ground research, August 2026 Compiled from the cities' own water quality reports, Utah Geological Survey Special Study 127, the Utah State Hazard Mitigation Plan, Washington County GIS hazard layers, NOAA climate records, EPA radon zones and Census QuickFacts. 1 section cited. Hover a number above for the section.
  2. 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.

The rest of water treatment

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

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