A reverse osmosis system is easy to forget about when it’s working. Water comes out of the dedicated faucet, tastes clean, and you move on with your day. The system fails quietly. The water starts tasting different. The flow slows to a trickle. The tank doesn’t refill the way it used to. Or water appears under the sink where it shouldn’t be.
Legend Plumbing provides reverse osmosis repair for homes throughout Sarasota and the surrounding area. We diagnose the problem, replace worn components, and get the system back to producing clean water. For new system installation, see our reverse osmosis installation page. For broader water quality issues, our water quality services team can help.
Why RO Systems Fail in Sarasota
Reverse osmosis systems are durable, but they don’t last forever. Sarasota’s water puts specific stress on them.
Very Hard Water Clogs Pre-Filters Faster
Sarasota’s water measures around 12.7 grains per gallon. That mineral content means pre-filters load up with sediment and scale faster than they would in areas with softer water. A pre-filter that should last 12 months may need replacement in 6 to 9 months here. When the pre-filter clogs, water production slows and the membrane works harder.
Chlorine and Chloramines Degrade the Membrane
Municipal water in Sarasota is treated with chlorine or chloramines for disinfection. Those chemicals are necessary for safety, but they attack the RO membrane over time. The carbon pre-filter protects the membrane, but only as long as the carbon is still active. Once the carbon is exhausted, chlorine passes through to the membrane and shortens its lifespan.
Sediment in the Water Supply
Sarasota’s water carries fine sediment that can accumulate in the system’s tubing, valves, and storage tank. Over time, that buildup restricts flow and affects water quality.
Storage Tank Bladder Failure
Most under-sink RO systems use a pressurized storage tank with a bladder inside. When the bladder fails, the tank loses pressure and the system stops delivering water at the faucet. This is one of the most common RO failures and often mistaken for a system-wide problem.
Signs Your RO System Needs Repair
Water Production Slows Down
If the dedicated faucet trickles instead of flowing, the system is producing less water than it should. Common causes include clogged pre-filters, a failing membrane, or a storage tank that’s lost pressure.
Water Tastes Different
RO water should taste clean and neutral. If it starts tasting like tap water, the membrane or post-filter may have stopped working. If it tastes metallic or off, the carbon filter may be exhausted.
Continuous Drain Flow
RO systems send wastewater to the drain as part of the filtration process. If the drain runs continuously — even when the system isn’t producing water — the auto-shutoff valve or flow restrictor may have failed.
Strange Noises
Gurgling, hissing, or clicking sounds that don’t stop can indicate a problem with the auto-shutoff valve, the check valve, or the drain line.
Water Looks Cloudy or Discolored
Cloudy water from an RO faucet usually means the membrane or pre-filter isn’t doing its job. Discolored water could indicate the carbon filter is releasing trapped contaminants.
Water Under the Sink
Leaks can develop at any connection in the system — the supply line, the drain line, the storage tank, or the faucet. A slow leak under the sink can cause cabinet damage if it isn’t addressed.
Storage Tank Feels Heavy or Full But No Water Comes Out
When the bladder inside the storage tank fails, the tank may still feel full but the system can’t push water out. The tank usually needs replacement.
Common RO Repairs We Handle
Filter Replacement
Pre-filters, carbon filters, and post-filters need replacement on a schedule. We replace them with the correct cartridges for your system. Sediment and carbon filters typically last 6 to 12 months. Post-filters usually last about 12 months.
Membrane Replacement
The RO membrane is the core of the system. It typically lasts 2 to 3 years. Membranes fail faster when pre-filters aren’t replaced on schedule. We test the membrane’s performance and replace it when it’s no longer removing dissolved solids effectively.
Storage Tank Replacement
A failed bladder in the storage tank stops the system from delivering water. We test tank pressure and replace the tank when needed.
Auto-Shutoff Valve Replacement
The auto-shutoff valve stops water from flowing when the tank is full. When it fails, the system either runs continuously or stops producing water altogether. We test and replace the valve.
Check Valve Replacement
The check valve prevents water from flowing backward through the system. When it fails, the system may produce water continuously or lose pressure at the faucet.
Flow Restrictor Replacement
The flow restrictor controls how much wastewater exits the system. When it clogs or fails, the system’s efficiency drops, and water quality may suffer.
Faucet and Tubing Replacement
The dedicated faucet and the tubing that connects the system can develop leaks or blockages. We replace worn faucets and rerun tubing when needed.
Leak Repair
Any connection in the system can develop a leak. We identify the source and repair or replace the affected component. If you also need other plumbing work done, see our plumbing repair page.
When to Repair vs. Replace an RO System
Repair Makes Sense When:
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The system is under 7 years old
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The problem is isolated to one component (filters, membrane, tank, valve)
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The system’s housing and fittings are still in good condition
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The repair cost is well below the cost of a new system
Replacement May Be Better When:
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The system is 10+ years old and multiple components are failing
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Replacement parts are no longer available
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The system uses outdated technology with higher wastewater ratios
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Repairs are becoming frequent
Modern RO systems use less water, produce water faster, and take up less space. If your system is older, replacing it may be more cost-effective than repairing it.
What to Expect During a Repair Visit
Step 1: You describe the problem. Tell us what’s happening — slow flow, off-tasting water, leaks, or unusual noises.
Step 2: We diagnose. We test the system’s components, check filter condition, measure TDS at the faucet, and inspect connections for leaks.
Step 3: We explain your options. You’ll know which parts need replacement and what the cost will be before we start work.
Step 4: We complete the repair. Most RO repairs are finished in one visit.
Step 5: We test. After the repair, we confirm the system produces water at the correct rate and that the water quality is where it should be.
Maintenance That Prevents Repairs
A few habits extend the life of your RO system.
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Replace pre-filters on schedule — Sediment and carbon filters should be replaced every 6 to 12 months in Sarasota’s water.
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Replace the membrane on schedule — Every 2 to 3 years, or sooner if water quality drops.
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Sanitize the system periodically — Prevents bacterial growth in the storage tank and tubing.
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Watch the drain line — If wastewater runs continuously, the auto-shutoff valve has likely failed.
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Check under the sink periodically — Look for drips, moisture, or discoloration that could indicate a slow leak.
If your water heater or softener is also due for service, our water heater repair and water quality services teams can help.
Why Choose Legend Plumbing for RO Repair in Sarasota Florida
Local Experts
We understand Sarasota Florida water quality challenges and the specific issues that affect RO systems in our area. Visit our Water Quality Services page to learn more.
Licensed Professionals
Every plumber on our team is fully licensed and insured. You can trust your repair is done right. Explore our Plumbing Repair and Residential Plumbing Services pages for our full range of expertise.
Honest Pricing
We provide clear estimates with no hidden fees. You’ll know the cost before we start.
Quality Parts
We use genuine replacement parts from reputable manufacturers. We don’t use inferior parts that could fail prematurely.
Complete Service
From diagnosis to repair to maintenance, we’re your complete RO resource. We also offer Reverse Osmosis Systems and Reverse Osmosis Installation services.
Service Areas
Legend Plumbing provides reverse osmosis repair throughout Sarasota County and the surrounding area. If you’re in one of these communities, we’re within reach:
Not sure if we serve your area? Reach out and ask.
Other Services We Provide
Along with reverse osmosis repair, Legend Plumbing handles:
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Reverse Osmosis Installation — new RO system installation
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Water Quality Services — testing and treatment for water issues
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Plumbing Repair — general repairs for fixtures and pipes
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Water Heater Repair — tank and tankless systems
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Water Heater Installation — new water heater installation
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Tankless Water Heater Installation — tankless systems
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Drain Cleaning — routine drain maintenance
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Clogged Drain Repair — for stubborn clogs
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Sewer Line Repair — damaged sewer lines
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Leak Detection — finding hidden leaks
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Slab Leak Repair — leaks under concrete slabs
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Toilet Repair — toilet fixes and replacements
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Faucet Repair — faucet repairs and installations
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Garbage Disposal Repair — disposal fixes
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Pipe Repair — damaged pipe repairs
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Repiping Services — full and partial repiping
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Hydro Jetting — high-pressure drain cleaning
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Residential Plumbing Services — household plumbing
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Commercial Plumbing Services — commercial plumbing needs
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Emergency Plumber — urgent service when problems can’t wait
Questions About Reverse Osmosis Repair in Sarasota
How do I know if my RO system needs repair?
Signs include slow water production, bad taste or odor, low pressure, continuous running, leaks, unusual noises, or cloudy water.
How long does RO repair take?
Most repairs take 1-2 hours, depending on the issue. We provide a specific timeline during your consultation.
Can I repair my RO system myself?
RO systems have multiple components and precise requirements. DIY repairs can cause additional damage. Professional repair is safer and more reliable.
How much does RO repair cost?
Costs vary based on the problem and parts needed. We provide clear estimates before we start any work.
How often should I replace RO filters?
Pre-filters and post-filters typically need replacement every 6-12 months. The RO membrane lasts 2-5 years. We provide specific recommendations for your system.
Should I replace or repair my RO system?
This depends on the problem and the age of your system. We evaluate your system and recommend the most cost-effective solution. Visit our Reverse Osmosis Systems page for replacement options.
Do you repair RO systems on well water?
Yes. We repair RO systems for well water as part of our Well Water Filtration services.