Low or No Flow from RO Faucet

This is the most common RO problem. If water from your RO faucet is slow or absent, here is the diagnostic checklist:

  1. Check the tank: Is the tank full? If you just emptied the tank and there is no new water coming in, the issue is production, not flow. Open the faucet to see if water flows at all — a complete blockage is rare.
  2. Replace pre-filters: The sediment and carbon pre-filters are the #1 cause of low RO flow in Orlando. They trap sediment and rust from aging pipes, filling up quickly. If your pre-filters are older than 6 months, replace them. This solves 60% of low flow problems and costs only $18-35.
  3. Check membrane age: The RO membrane gradually loses production capacity over time. A 2-3 year old membrane may produce only 30-40% of its rated capacity. If your membrane is over 2 years old and pre-filters are new, replace the membrane ($80-150).
  4. Check tank pressure: The storage tank should have 7-8 PSI of air pressure when the tank is empty. Check with a bicycle tire gauge. Low pressure means the tank cannot push water out efficiently. Add air with a bicycle pump.
  5. Check incoming water pressure: Orlando's municipal pressure (40-80 PSI) is adequate for RO. If your pressure is below 40 PSI, the membrane cannot produce water effectively. A booster pump ($100-200) can solve this.

Bad Taste or Odor from RO Water

If your RO water tastes flat, sour, or has an odor, these are the likely causes:

  • Post-carbon filter needs replacement: The post-carbon filter polishes taste after the membrane. When it gets saturated (usually 12 months), it stops removing odors. Replace the post-carbon filter — this is the most common cause of taste problems.
  • RO membrane is failing: A damaged or exhausted membrane cannot remove contaminants effectively. If replacing the post-carbon filter does not fix the taste, replace the membrane.
  • Storage tank needs sanitization: Biofilm can build up inside the tank over time, especially if water sits in the tank for extended periods. Flush the system by draining the tank, sanitizing with a food-grade hydrogen peroxide solution, and refilling.
  • Remineralization cartridge is depleted: If your system has a remineralization stage, the calcium carbonate is consumed over time and needs annual replacement. Without it, RO water tastes flat and slightly acidic.

Leaks from the RO System

RO system leaks are usually at connection points and easily fixed:

  • Under the sink, near the system: Tighten all compression fittings. Check O-rings on filter housings — a missing or cracked O-ring is the most common leak cause.
  • From the storage tank: A leak from the tank itself means the internal bladder is ruptured. The entire tank needs replacement ($50-80). This is a 10-minute DIY job — shut off water, drain tank, disconnect, replace.
  • From the drain line: Check the air gap device and drain saddle connection. A loose drain line connection is easily fixed by tightening the clamp.
  • From the faucet: A dripping faucet after the system is off usually indicates a worn faucet cartridge. Replace the RO faucet ($20-40).

Tank Not Filling or Refills Slowly

If your tank refills very slowly or will not fill at all:

  • Depleted membrane: After 2-3 years, the membrane's production rate drops dramatically. If your membrane is older than 2 years, replace it. A new membrane restores production to 95%+ of rated capacity.
  • Low tank air pressure: Check the tank's air valve (like a tire valve) with a bicycle gauge. If it reads below 7 PSI, the tank cannot accept water efficiently. Add air until it reads 7-8 PSI when the tank is empty.
  • Clogged feed water adapter: The saddle valve connecting the cold water line to the RO system can become clogged with sediment. Clean or replace the adapter.

Bottom line: Most RO system problems are DIY-fixable. Low flow is usually clogged pre-filters (replace every 6 months in Orlando). Bad taste is a depleted post-carbon filter (replace annually). Leaks are loose fittings or cracked O-rings. A tank that will not fill usually has a depleted membrane (replace every 2-3 years). If you are unsure about any repair, shut off the water supply and call a professional plumber ($150-250 in Orlando).

When to Call a Professional

Most RO problems are DIY-fixable, but some situations require professional help:

  • Persistent leaks after tightening: If you have tightened all fittings and the leak continues, the fitting itself may be cracked or the O-ring is damaged beyond repair. Call a plumber.
  • Drain line clogs: A clogged drain line can cause water to back up under the sink. Clearing a drain clog requires a plumber's snake or auger.
  • Electrical issues: If your RO system has a UV sterilizer or automatic shutoff valve with electrical connections, any wiring issue requires a licensed electrician or plumber.
  • Faucet replacement: If you need a new faucet installed through granite or quartz, hiring a professional prevents cracking. Cost: $100-200.

Orlando plumber costs: Average call-out fee is $75-150. Hourly rate is $80-120/hour. Total cost for most RO repairs: $150-250. Factor this into your decision of whether to DIY or call a professional.

Bottom line: Most RO system problems are DIY-fixable for under $100 in parts. The key is methodical troubleshooting: check the tank, replace pre-filters, test the membrane, and check tank pressure. Only call a professional plumber for persistent leaks, drain clogs, or electrical issues. For Orlando homeowners, DIY RO maintenance saves $200-400 per year compared to professional service. But when in doubt, call a pro — the $150-250 repair cost is small compared to water damage from an untreated leak.

Why is my RO system producing low flow?

Low RO flow is usually caused by: clogged pre-filters (replace every 6 months in Orlando), a worn-out membrane (replace every 2-3 years), low incoming water pressure (Orlando's 40-80 PSI is adequate, but pressure below 40 PSI reduces flow), or a depleted storage tank (check tank pressure — should be 7-8 PSI when empty). Start by checking and replacing pre-filters; this solves 60% of low flow problems.

Why does my RO water taste bad?

Bad-tasting RO water is usually from a depleted post-carbon filter (replace annually) or a failing membrane. The post-carbon filter polishes taste after the membrane — when it gets saturated, it stops removing odors. If replacing the post-filter does not help, the membrane may be damaged and needs replacement. Also check that the storage tank is properly sanitized — biofilm can build up over time.

How do I fix an RO system leak?

Most RO leaks come from connection points: tighten all compression fittings, check O-rings on filter housings, and inspect the drain line connection. If the leak is from the storage tank, the internal bladder may be ruptured and the tank needs replacement ($50-80). For persistent leaks, shut off the water supply valve and call a professional plumber.

Why is my RO tank not filling?

A tank that will not fill or refills slowly indicates: depleted RO membrane (85-95% loss of production after 2-3 years), low tank air pressure (should be 7-8 PSI when empty — check with a tire gauge), or a clogged feed water adapter. Replacing the membrane restores production. Adding air to the tank is a 5-minute DIY fix that costs nothing.

How often should I call a plumber for RO problems?

Most RO problems are DIY-fixable: filter changes ($30-60 in parts, 15 minutes), tank pressure adjustment ($0, 5 minutes), and faucet replacement ($20-40, 30 minutes). Call a professional plumber only for: persistent leaks after tightening fittings, drain line clogs, or electrical issues with advanced systems. Average plumber call cost in Orlando: $150-250.