Water Filtration Systems on O'ahu
O'ahu's water supply is safe but can carry chlorine taste, sediment, and other compounds that affect how your water looks, tastes, and feels. We install, service, and maintain water filtration systems for every home and budget.
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What We Do
Water Filtration Solutions We Install
From basic sediment filters to whole-house multi-stage systems — we match the right solution to your water quality goals.
Whole House Filtration
A whole house filter treats every drop of water entering your home — for drinking, cooking, bathing, and laundry. Single-stage or multi-stage systems available depending on what you want removed.
Under-Sink Filters
Point-of-use filters installed under your kitchen sink deliver clean drinking and cooking water right at the tap. Compact, effective, and easy to maintain with annual filter changes.
Reverse Osmosis (RO) Systems
RO systems push water through a semi-permeable membrane, removing up to 99% of dissolved solids, chlorine, fluoride, and other contaminants. The gold standard for drinking water quality.
Sediment Filters
O'ahu's water can carry sediment and particulates that clog fixtures and cloud water. Sediment pre-filters protect your appliances and downstream filtration stages.
Filter Replacement & Maintenance
Filters need regular replacement to stay effective. We service all brands and can set up a maintenance schedule so you never forget. We also service water softeners.
Water Quality Testing
Not sure what's in your water? We can arrange water quality testing to identify what's actually present and recommend the right filtration solution for your specific situation.
Don't Wait
Signs Your Water May Need Filtration
Chlorine taste or odor from the tap
Cloudy or discolored water
White or yellowish scale buildup on fixtures and showerheads
Staining on sinks, tubs, or laundry
Water smells like rotten eggs (sulfur)
Family members with sensitive skin or allergies to tap water
You're buying bottled water for drinking and cooking
Older home that may have lead solder in the plumbing
Common Questions
Frequently Asked Questions
Is O'ahu tap water safe to drink?
The Honolulu Board of Water Supply treats and monitors the water supply to meet federal safe drinking water standards. However, 'safe' and 'great tasting' aren't the same thing. Chlorine, sediment, and other compounds can affect taste and smell. A filtration system removes these without affecting safety.
What's the difference between a water filter and a water softener?
A water filter removes contaminants, sediment, chlorine, and other compounds from the water. A water softener specifically addresses hard water by removing calcium and magnesium minerals that cause scale buildup. Many homes benefit from both — a filter for taste and a softener for scale protection.
How often do I need to replace my water filter?
It depends on the system and your water usage. Most under-sink filters need replacement every 6–12 months. Whole-house sediment pre-filters may need replacement every 3–6 months. RO membrane cartridges typically last 2–3 years. We'll give you a replacement schedule when we install your system.
Can you install a filtration system on any plumbing?
Yes. We assess your existing plumbing and recommend the appropriate installation approach. Whole-house systems connect to the main supply line at the point of entry. Under-sink systems connect to the cold water supply under the kitchen sink. Both work with any standard residential plumbing.
Does a reverse osmosis system waste a lot of water?
Traditional RO systems do produce some wastewater — typically 3–4 gallons for every 1 gallon filtered. Modern high-efficiency RO systems have improved this significantly, with some producing as little as 1:1. We'll discuss the options and tradeoffs when you request an estimate.
Better Water Starts with a Call
Clean, great-tasting water for your whole family. Call Alpha Omega for a free water filtration estimate on O'ahu.