Buying Guides
Choose the right system the first time
Everything you need to know before choosing a water filtration system — written specifically for homes in Rosarito and Baja California.
Serving Rosarito and all of Baja California.
System Types
Understanding water filtration systems
Not all systems do the same thing. Each type targets different contaminants and serves a different purpose. In Baja, most homes benefit from a combination rather than relying on a single system.
Whole-House Filtration
Installed at your main water line, a whole-house system treats every drop entering your home. Removes sediment, chlorine, and heavy particles before water reaches your faucets, showers, and appliances. In Baja, where municipal water carries high sediment loads, this is the foundation of any good filtration setup. It protects your water heater, washing machine, and plumbing from the scale and grit that shortens their lifespan.
Reverse Osmosis (RO)
RO pushes water through a semi-permeable membrane that blocks dissolved solids, heavy metals, bacteria, and virtually all contaminants at the molecular level. Typically installed under the kitchen sink. RO removes 95–99% of total dissolved solids — critical in Baja where TDS often exceeds 500 ppm, well above the recommended 300 ppm for drinking water.
UV Purification
Ultraviolet purification uses UV-C light to destroy bacteria, viruses, and other microorganisms by disrupting their DNA. It does not remove dissolved minerals or chemicals — its sole job is disinfection. UV is essential for homes that rely on well water or tinaco storage, where bacteria can multiply between deliveries or during power outages when chlorine dissipates.
Water Softeners
Softeners use ion exchange to replace calcium and magnesium ions with sodium, reducing the hardness that causes scale buildup. Baja California has some of the hardest water in Mexico, often exceeding 300 ppm of hardness. White deposits on faucets, cloudy spots on glassware, or a water heater that needs frequent repair? Hard water is the culprit.
Decision Guide
Match the system to the problem
| Problem | Solution |
|---|---|
| Cloudy, sandy, or discolored water | Whole-house sediment filtration |
| Bad taste or chlorine smell | Whole-house carbon filtration or under-sink RO |
| High TDS (salty or mineral taste) | Reverse osmosis |
| Scale on fixtures, appliance damage | Water softener |
| Bacterial contamination or well water | UV purification |
| All of the above (common in Baja) | Whole-house + RO + UV combination |
How It Works
Understanding filter stages
Multi-stage systems use a series of filters, each targeting different contaminants. More stages isn't always better — what matters is having the right stages in the right order.
- 1
Sediment filter (5–20 micron)
First line of defense. Catches sand, dirt, rust, and particulates visible to the naked eye. In Baja, sediment filters work overtime — you'll likely see a brand-new white filter turn brown within weeks. This is normal and exactly why you need one. It also protects the finer filters downstream from clogging prematurely.
- 2
Activated carbon filter
Carbon adsorbs chlorine, VOCs, pesticides, and chemicals that cause bad taste and odor. Two types: granular activated carbon (GAC) for general improvement, and carbon block for finer filtration. Carbon is what makes your water taste clean — and is essential as a pre-filter for RO membranes since chlorine destroys RO membranes on contact.
- 3
RO membrane (0.0001 micron)
The heart of an RO system. This semi-permeable membrane rejects dissolved solids, heavy metals (lead, arsenic, mercury), fluoride, sodium, and nitrates. Quality membranes last 2–3 years. The membrane takes your water from 500+ TDS down to 20–50 TDS — essentially purified water.
- 4
UV sterilization chamber
A UV lamp inside a stainless steel chamber exposes water to ultraviolet light at 254 nanometers — the wavelength that destroys microbial DNA. Kills 99.99% of bacteria, viruses, and cysts without adding chemicals. UV bulbs need replacement annually and the quartz sleeve should be cleaned every 6 months.
Choosing a Provider
What to look for in a water filtration company
In Baja there is no shortage of people willing to sell you a filter. The difference between a good purchase and an expensive mistake usually comes down to the company behind it.
Local experience matters
A company that installs systems in Baja understands the specific challenges — high TDS, inconsistent water pressure, hard water, and the unique plumbing configurations common in Mexican construction. What works in San Diego does not always work in Rosarito.
They should test your water first
Any reputable company will test your water before recommending a system. If someone tries to sell you a specific system before knowing your water quality, that's a red flag.
Ask about ongoing support
Filters need regular replacement. Membranes need monitoring. Systems need occasional servicing. Choose a company that offers maintenance plans and can respond when something goes wrong — not one that disappears after installation.
Verify the products
Ask what brands and components are used. Quality systems use NSF-certified filters and name-brand membranes (Filmtec, Hydranautics). Cheap no-name filters may cost less upfront but deliver worse performance and shorter life.
Get a written quote with specifics
The quote should list every component, the installation scope, warranty terms, and what is included. Vague quotes lead to surprise costs.
Installation
Installation considerations for Baja homes
Installing water filtration in Baja comes with challenges you won't find in a typical US installation. Knowing about them upfront prevents problems and extra costs later.
Water pressure
Many Baja homes rely on rooftop tinacos that deliver only 15–25 PSI. Reverse osmosis systems need at least 40 PSI to function properly. If your home has low pressure, you'll need a booster pump installed alongside the RO system. Whole-house systems also reduce pressure slightly, so starting pressure matters.
Plumbing compatibility
Baja homes use a mix of copper, CPVC, PEX, and sometimes galvanized steel pipe. Main lines may be 3/4-inch or 1-inch. Your installer needs to assess existing plumbing and have the right adapters. Drain access is also needed for RO systems and water softeners (backwash cycles).
Space requirements
Whole-house systems need a location near the main water entry — often outdoors or in a utility area. They require about 2–3 feet of wall space and should be protected from direct sun. Under-sink RO systems need space beneath the kitchen counter for the unit and storage tank. Tankless RO systems save space but require an electrical outlet nearby.
Be Prepared
Questions to ask before buying
A good company will answer all of these clearly and without pressure.
- 1What are my water test results, and what do they mean?
- 2Why are you recommending this specific system?
- 3What is the total installed cost, including all parts and labor?
- 4What are the ongoing maintenance costs?
- 5What is the warranty, and what does it cover?
- 6Do you offer maintenance service, and how quickly can you respond?
- 7Will my water pressure be affected?
- 8How long does installation take, and will my water be off during the process?
Find out what's actually in your water
A free water test takes less than an hour and tells you exactly what you're dealing with.