What to Expect During a Water Softener and Reverse Osmosis Installation

Homeowners considering a water softener or reverse-osmosis system usually want to know what actually happens before they commit to it. Here is the whole sequence, from the first visit to the handover, plus the things that genuinely change the price and the timeline.

Step One: The Free Water Test and Assessment

Nothing gets scheduled before a plumber has seen the house. The visit covers four things.

Testing the Water

Hardness is measured in grains per gallon, and it drives the equipment sizing more than any other single number. Treasure Valley readings vary widely by neighbourhood, by season, and above all by whether you are on municipal supply or a private well, so a published city average is a starting point rather than an answer. Our Treasure Valley water softener guide has the local ranges if you want to know roughly where you are likely to land before anyone visits.

Checking the Installation Area

A softener needs somewhere sensible to live, near where the main water line enters the house. Garages, basements, and utility rooms are the usual spots. It needs enough clearance to open the brine tank and haul salt to it, which is easy to overlook until it is installed somewhere awkward.

Confirming Drain and Power

Regeneration flushes to a drain, so the location has to reach one. Most modern softeners also need a standard outlet nearby. Where neither exists, running them is additional work, and that is priced before anything is ordered.

Checking Incoming Pressure

Equipment has real operating limits. Incoming pressure needs to sit at or below 80 PSI for both a softener and an RO unit to work correctly and stay within warranty. High pressure is common enough in the valley, and where it is found the fix is a pressure-reducing valve, which is straightforward but is its own line item.

Step Two: Approve the Job and Pick a Date

The assessment produces a clear, upfront price for exactly what your home needs. There is no pressure to decide on the spot, and nothing is added afterwards. If the house needs something beyond a standard installation, you see that cost before you agree to anything, not on the final invoice.

Step Three: Installation Day

A standard installation covering a whole-home softener and a reverse-osmosis system averages around five hours.

The Softener

The unit is plumbed into the main line so everything downstream is treated. Where a home already has a service loop roughed in, this goes quickly. Where it does not, the line has to be cut and reworked, which is the single biggest swing in installation time. The drain line is run, the unit is levelled, and the brine tank is positioned somewhere you can actually get salt into.

The Reverse-Osmosis Unit

The RO system mounts under the kitchen sink and connects to its own dedicated faucet at the counter. If the sink or countertop has no spare hole for that faucet, one has to be drilled. In stainless steel that is routine. In granite, quartz, or composite it is slower and needs more care, and it is worth flagging at the assessment rather than on the day.

What Moves the Timeline

Step Four: Startup and Walkthrough

Once everything is in, the plumber starts the system and runs it through its first cycle. Softener resin is rinsed, the brine tank gets its initial salt, and the RO membrane is flushed before the water is used, which is standard for a new membrane.

Then comes the part people actually remember: the walkthrough. How to check the salt level and what type to buy. What the regeneration cycle sounds like, so the noise at two in the morning is not alarming the first time. Which RO filter comes out at which interval and how to do it. You should not be left guessing how to maintain equipment you just paid for.

Living With It Afterwards

The ongoing commitment is modest. Salt gets topped up periodically, with frequency depending on hardness and household size. RO pre-filters and the post-filter come out on a schedule, commonly in the range of six to twelve months depending on the unit and the incoming water; the membrane itself typically lasts substantially longer. Follow the intervals in your equipment's manual, since they vary by model.

The one thing worth watching is the brine tank. Salt occasionally forms a hard crust or a bridge with an air gap underneath, which makes the softener look like it has salt while it quietly stops regenerating properly. Breaking it up is a two-minute job once you know to check.

What Falls Outside Standard Pricing

Most homes fall inside standard scope. The common reasons one does not:

None of these are reasons to turn a job away. They are reasons to price it accurately, before installation begins rather than after.

Ready to Get Started?

Mountain Time Plumbing is currently offering a Novo cabinet softener and a Halo Ultra Plus reverse-osmosis system installed for $2,999, through September 30, 2026, for homes within about 30 miles of Meridian.

If you are still deciding whether you need one system or both, reverse osmosis vs water softener covers that first. Otherwise, call (208) 993-0717 or book the free assessment and we will confirm the next available appointment.