Professional-grade RO installation, maintenance, and repair for San Antonio homes. Remove up to 99% of contaminants delivered by the veteran-owned team that stands behind every wrench turn.
The Technology
Reverse osmosis is the gold standard of home water filtration. It pushes your tap water through a semipermeable membrane at the molecular level, stripping out up to 99% of dissolved contaminants before the water ever reaches your glass.
Unlike simple carbon filters or pitcher-style filters, an RO system tackles the full spectrum of what San Antonio's water supply can carry minerals, metals, chemicals, and microbial threats leaving you with water that's genuinely clean, not just cleaner.
A properly installed RO system under your kitchen sink provides an unlimited supply of purified water on demand no bottles to haul, no filter pitchers to refill.
Dissolved Minerals
Calcium, magnesium, and other scale-builders
Chlorine & Chemicals
Treatment chemicals affecting taste and odor
Heavy Metals
Lead, arsenic, mercury, and chromium
Bacteria & Viruses
Microbial contaminants at the source
Nitrates & Nitrites
Common in areas with agricultural runoff
Sediment & Turbidity
Fine particles and cloudiness in tap water
Local Context
San Antonio draws its water primarily from the Edwards Aquifer one of the most productive aquifer systems in the world, but also one that naturally carries a high mineral load. That's why your faucets build up scale, your coffee tastes off, and your appliances wear out faster than they should.
Beyond hardness, San Antonio's water supply goes through conventional treatment that leaves behind chlorine, disinfection byproducts, and trace contaminants that a standard pitcher filter simply can't catch. An RO system installed at the point of use typically under the kitchen sink handles all of it.
Our team has been working with San Antonio's water for years. We know the local water chemistry and can recommend the right RO configuration for your home, including pre-filtration stages for particularly challenging supply conditions.
What We Do
From selecting the right system to keeping it performing for 10-15 years, we handle everything. No sub-contractors, no hand-offs just our licensed plumbers doing the work right the first time.
We assess your water quality, recommend the right system for your household size and water use, and install it cleanly under your sink with a dedicated faucet. You'll get a full walkthrough of the system before we leave.
An RO system is only as good as its filters. We replace pre-filters, carbon filters, and RO membranes on schedule to keep your water quality at peak performance. We also inspect connections and pressure for any early-warning issues.
Slow output, strange taste, or a leaking system? We diagnose and fix RO problems on any brand. We also upgrade existing systems with better membranes, remineralization stages, or UV purification for elevated protection.
Why It Matters
No heavy metals, no chlorine byproducts, no microbial risk. RO-filtered water is among the cleanest you can get at home a meaningful upgrade when you consider how much water your household drinks and cooks with daily.
Coffee, tea, soups, and ice taste noticeably better with purified water. When you remove the chlorine and dissolved solids, what you're tasting is the ingredient not the water it came from.
Many San Antonio families spend heavily on bottled water each year. A whole-house RO system pays for itself within a couple of years and produces purified water for a fraction of a cent per gallon.
Hard water and dissolved minerals are behind most of the scale buildup that shortens the life of water heaters, ice makers, coffee machines, and faucets. Cleaner water means less maintenance and longer-lasting equipment.
Turn the dedicated RO faucet and you get purified water instantly. No waiting for a pitcher to filter, no running to the store. The pressurized storage tank ensures you always have clean water ready when you need it.
Thousands of plastic bottles per year, per household. An under-sink RO system eliminates that entirely and delivers water that's independently verified to be cleaner than most bottled brands.
Why O5
The RO units at big-box stores may look identical to the systems we install. They're not. We source professional-grade units from plumbing supply companies systems with thicker housings, better membranes, tighter fittings, and manufacturer warranties that actually hold up.
Beyond the equipment, installation quality determines how long your system lasts and how clean your water stays. Our licensed plumbers make clean, leak-free connections, set the system pressure correctly, and verify output before they consider the job done.
Request a QuoteDiscipline and accountability built into every job the same standards we held ourselves to in service.
We know San Antonio's water chemistry. We size and configure systems specifically for what's coming out of your tap.
No retail-grade units. We install the same systems that commercial facilities trust with proper warranties.
After the scope is clear, you approve the quote before work begins. No hourly billing, no surprise line items after the fact.
Customer Reviews
"Adam installed our RO system, and we couldn't be happier with the experience. He was extremely friendly, took the time to explain everything in detail, and did the work very thoroughly. His pricing was very reasonable. Highly recommend o5 Plumbing."
Alicia L.
Stone Oak • RO System Install
"Our water in Schertz was terrible white scale on everything, awful taste. O5 put in a reverse osmosis system and did a filter service on our softener the same day. Night and day difference. These guys know San Antonio water."
Marcus R.
Schertz • RO + Softener Service
"We had a different company install our RO two years ago and it was always slow. O5 came out, diagnosed the issue immediately undersized membrane for our water pressure and had it fixed same day. Should've called them first."
Jennifer T.
Alamo Heights • RO System Repair
Common Questions
Get Started
Call us and we'll walk you through the right system for your home, give you a flat-rate quote, and schedule at a time that works for you. No slick sales pitch just straight answers.
Mon-Fri 7:30 AM - 6:00 PM • Sat 8:00 AM - 5:00 PM • Same-day service when available
