DIY Water Purifier Installation Made Easy

Written by Craig "The Water Guy" Phillips

We'll save thousands by installing our own whole-house water purification system instead of hiring a contractor. Start by testing your water, then budget around $2,200 for a sediment filter, softener, and reverse osmosis unit. We'll convert copper pipes to PEX using simple SharkBite fittings, mount each component with bypass valves, and add an under-sink RO for drinking water. Stick with us and we'll walk you through every step.

Key Takeaways

• Test your water first to identify hardness, sediment, or bacterial issues, then budget around $2,200 for a complete filtration system.
• Use SharkBite fittings for tool-free copper-to-PEX conversions, and run 3/4-inch PEX for adequate flow throughout your home.
• Mount your sediment filter on plywood with bypass valves on both sides, and position the softener nearby with brine tubing connected.
• Install the RO system under the sink by splitting the cold supply, mounting the tank, and flushing it twice before drinking.
• Maintain your system by swapping filters every 3–6 months, topping off salt regularly, and replacing the UV lamp annually.

Budget, Tools, & Water Tests Before You Start

Before we spend a single dollar on equipment, we'll want to test our water first—either with a home test kit or a professional test (check out our separate water testing video for a full walkthrough). Testing reveals hardness, sediment, and bacterial issues, which directly determines whether we need UV, RO, or both.

For a 4–6 bathroom home, budget roughly $2,200 after a 10% promo for a sediment filter, softener, and RO system. Adding UV and a smart monitor pushes that to about $3,700. Tack on a few hundred more for PEX/copper adapters, fittings, and specialty tools.

Don't overlook ongoing costs—salt, filter replacements, and UV bulbs add up. Also reserve cabinet space for the softener tank, RO tank, and associated hardware.

Convert Copper Pipes to PEX for Your DIY Water Purifier

Now that we've got our budget locked in and our water test results in hand, it's time to get our hands dirty—starting with swapping out copper for PEX.

First, shut off water and breakers, cut out the copper section, and cap lines to maintain household access throughout the multi-day project. SharkBite fittings make copper-to-PEX conversions tool-free and fast.

SharkBite fittings make copper-to-PEX conversions tool-free—keeping your household running while the real work begins.

Here's our conversion sequence:

1. Cut and prep — Use a copper pipe cutter, then deburr and clean every stub before fitting PEX.
2. Size correctly — Run 3/4 in PEX for main lines to sustain proper flow across four to six bathrooms.
3. Secure and route — Clamp runs, add expansion loops, and use elbows near filters, softeners, and UV units.

Keep compression fittings, Teflon tape, and extra materials nearby—surprises happen.

Install Your Sediment Filter, Water Softener, & UV Filter

With our PEX lines in place, we're ready to install the three components that will actually clean our water: a sediment filter, water softener, and UV unit.

Mount the 500-micron sediment filter on 3/4" plywood, inlet left, outlet right, with bypass valves on both sides. Next, position the softener, connect the brine tank's push-fit tubing, load four 40 lb salt bags, and set regeneration to every 14 days or 3,926 gallons. Finally, mount the UV unit with clearance above the bulb, install the quartz sleeve using gloves, and add bypass valves.

Component	Key Step
Sediment Filter	Bypass valves both sides
Water Softener	Monitor first 90-minute cycle
UV Unit	Gloves for bulb installation

Watch that first softener regeneration cycle closely—leaks reveal themselves early.

Connect Your Under-Sink RO System & Refrigerator Line

The whole-house system is handling sediment, hardness, and bacteria—but for drinking and cooking water, we'll take things a step further with an under-sink reverse osmosis unit that pushes water through a membrane tight enough to strip out dissolved solids, chlorine byproducts, and trace contaminants.

Here's our install sequence:

Follow this install sequence to get your reverse osmosis system running cleanly, efficiently, and built to last.

1. Split the cold supply using the kit's T-fitting, clamp the drain saddle, then mount the cartridge assembly and tank with filter-swap clearance.
2. Route the faucet tubes through the soap-dispenser hole, click each quick-connect fitting until seated, then secure the faucet from beneath.
3. Tee the product line for the refrigerator, run tubing through cabinet backs or joists to a dedicated shutoff valve.

Pressurize, inspect every joint, flush the tank twice, and label your cartridges with change dates.

Maintain Your DIY Water Purifier Year-Round

Keeping your system healthy year-round takes less effort than you'd think—it's mostly a rhythm of swaps, checks, and salt refills spread across the calendar.

Swap your sediment pre-filter every 3–6 months before cloudy water signals trouble downstream. Top off the brine tank every few months—four 40 lb bags gets you started—and let the softener regenerate every 14 days or at 3,926 gallons.

Change RO pre/post filters on schedule, then flush the tank twice before drinking. Replace the UV lamp annually, keep that quartz sleeve spotless, and always handle the bulb with gloves.

Monthly, walk every valve, fitting, and drain line looking for drips. Stock Teflon tape, spare fittings, and a few feet of tubing—small preparation prevents big headaches.

Frequently Asked Questions

Can I Install a Water Purifier Myself?

Yes, you can! We'll save thousands by tackling this ourselves. With SharkBite fittings, bypass valves, and a solid water test first, we'll have clean, purified water flowing through our home confidently.

What Water Filters Remove Cryptosporidium?

We'll need filters rated at 1 micron absolute or smaller, reverse osmosis systems, or UV-C treatment to effectively eliminate Cryptosporidium. Combining RO with UV gives us the strongest layered protection against these chlorine-resistant oocysts.

How to Make a Water Purifier at Home Easy Way?

We'll start by testing our water, then install a sediment filter, water softener, and under-sink RO system using PEX tubing with SharkBite fittings—it's faster, cleaner, and built to last.

How to Install a Water Filtration System DIY?

We'll start by testing our water, then plan the whole-house flow, install sediment filters upstream, add a softener if needed, and finish with UV protection—giving us clean, safe water throughout every tap.