Quality Filters and Pumps
Central Florida RO System Guide

Residential RO System Repair in Central Florida: Membranes, Flow, and When to Call

By Chase Norris (Owner, Quality Filters And Pumps, FL License #7494) · Last updated July 18, 2026

Reverse osmosis systems installed on Central Florida well water face harder conditions than those installed on municipal water. The Floridan Aquifer delivers very hard water with dissolved iron, hydrogen sulfide, and total dissolved solids that stress RO membranes and clog pre-filters faster than typical product specifications assume. The most common complaints from Central Florida RO system owners are slow fill speed (usually a clogged pre-filter or failing membrane), rising TDS in product water (membrane fouling or bypassing), and a sulfur or iron taste that the RO system is not removing (a pre-treatment problem, not an RO problem). Quality Filters And Pumps services reverse osmosis systems throughout Central Florida, including membrane replacement, pre-filter service, storage tank sanitization, and system pressure diagnostics, under FL Water Well Contractor License #7494.

How an RO System Works (and What Fails First)

A standard 5-stage under-sink RO system processes water in this order: a sediment pre-filter (5 micron) removes particles; a carbon block pre-filter removes chlorine, organic compounds, and some dissolved gases; the semi-permeable RO membrane rejects dissolved solids by allowing water molecules to pass through while blocking minerals, heavy metals, nitrates, and most other contaminants; a post-filter carbon polisher removes any residual taste before the water enters the storage tank; and the storage tank holds 3 to 4 gallons of treated water for on-demand use.

In Central Florida well water applications, the failure sequence is predictable: the sediment and carbon pre-filters saturate faster than the manufacturer's schedule assumes because raw Floridan Aquifer water is not chlorinated and may carry fine sediment and dissolved iron. When pre-filters are not changed on schedule, the overloaded carbon filter passes organic compounds and dissolved gases downstream to the membrane. The membrane then fouls from combined iron, scale, and organic loading, and rejection drops. A TDS meter on the product water is the earliest warning. Verify the incoming pressure separately.

Diagnosing Common RO Problems in Central Florida

Slow Fill Speed

The most frequent complaint. Work through this sequence before calling a technician:

  1. Check and replace the sediment and carbon pre-filters. This resolves the majority of slow-fill calls. Replace on schedule (every 6 months in a typical Central Florida installation) regardless of appearance, because activated carbon exhausts chemically before it looks dirty.
  2. Measure incoming water pressure with a gauge at the cold supply under the sink. RO systems need at least 40 PSI to produce water at rated flow rates; most manufacturers specify 50 to 80 PSI as optimal. Central Florida well pressure switches are often set to 40 to 60 PSI cut-in to cut-out, which means pressure at the RO inlet can drop below 40 PSI when multiple fixtures run simultaneously. A dedicated booster pump on the RO supply line solves a persistent low-pressure problem. See the well pump and pressure system guide for context on why your pressure system setting matters.
  3. If pre-filters are fresh and pressure is adequate, test membrane rejection with a TDS meter. If product water TDS is more than 15 percent of inlet TDS, the membrane is degraded and should be replaced.
  4. Check the storage tank pre-charge pressure (should be 5 to 8 PSI with the tank empty). A waterlogged tank (failed bladder or discharged air pre-charge) causes the system to stop producing water well before the tank is full.

High TDS in Product Water

A working RO membrane should reject 95 percent or more of dissolved solids. If your TDS meter shows rejection dropping below 85 percent consistently, investigate in this order: check whether the membrane bypass O-rings are seated correctly (membrane housing O-ring failure allows unfiltered water to bypass the membrane entirely); verify the membrane was installed in the correct flow direction (most membranes are direction-specific); then consider membrane replacement if the above checks out. A new membrane that immediately shows poor rejection is often a counterfeit or improperly stored membrane, which is one reason to buy from a reputable local supplier or have a technician source the part.

In Central Florida, membranes fouled by iron scaling may still produce adequate flow but poor rejection, because the scale layer blocks pores selectively rather than uniformly. If you see consistent orange or rust-colored residue in the membrane housing when you open it for service, iron pre-treatment upstream of the RO is the underlying problem. Address it with an iron filter; see the iron and sulfur treatment guide for system options.

Iron or Sulfur Taste Persisting Through the RO System

An RO membrane is very effective at removing dissolved minerals, including iron. If you still taste iron or sulfur after the RO, the problem is upstream: high iron or H2S in the feed water is overwhelming the pre-filters and passing through in a form the membrane cannot adequately handle at that concentration, or the pre-filters are exhausted and are no longer protecting the membrane.

The solution is proper whole-house pre-treatment (iron filter and water softener) before the RO rather than expecting the RO to handle untreated Floridan Aquifer water. See the water softener installation guide and the well water filtration guide for the recommended treatment sequence.

Membrane Replacement in Central Florida Conditions

RO membranes in Central Florida well water installations typically last 2 to 3 years without upstream softening and iron removal, and 3 to 5 years with proper pre-treatment in place. Signs it is time:

  • TDS rejection below 85 percent measured at the product tap
  • Fill time for the storage tank noticeably longer than when the system was new
  • Visible mineral scale or rust discoloration inside the membrane housing on inspection
  • More than 5 years since the last membrane change regardless of measured performance

We stock standard 50 GPD and 75 GPD membrane sizes for the most common residential RO housings and can source larger commercial-grade membranes for whole-house RO applications. Service includes removing the old membrane, inspecting the housing and O-rings, installing the new membrane, and testing product water TDS before completing the visit.

Annual Sanitization

The storage tank and system lines should be sanitized annually with a dilute bleach solution or specialized RO sanitizer tablets. Biofilm can grow in the storage tank and post-filter housing in Florida's warm conditions, especially in homes where the RO system sits unused for extended periods (vacation homes, rental properties). Sanitization includes flushing all lines, the storage tank, and the post-filter housing, then running a flush cycle before returning the system to service.

For a maintenance contract covering your full water treatment system (iron filter, softener, RO, and well pump) under a single annual visit, see the maintenance contracts page. For filtration system repair beyond the RO, see the filtration repair service page.

Common questions about RO system repair in Central Florida

How do I know when my RO membrane needs to be replaced in Central Florida?

The most reliable indicator is a rising TDS (total dissolved solids) reading in the product water, measured with an inexpensive TDS meter. A healthy membrane rejects 95 percent or more of TDS; when rejection drops below 85 percent consistently, membrane replacement is warranted. In Central Florida hard water, membranes that are not protected by an upstream softener or carbon pre-filter may foul in 18 to 24 months. With proper pre-treatment, a membrane typically lasts 3 to 5 years.

Why is my under-sink RO system filling so slowly?

Slow fill is the most common RO complaint and has several causes: a clogged sediment or carbon pre-filter (most common, fix first), a fouled or damaged membrane, low incoming water pressure (RO systems need at least 40 PSI to function; Central Florida well systems sometimes run at 40 to 45 PSI which is marginal), a failed pressure tank in the RO storage assembly, or a kinked supply line. Check and replace the pre-filters first, then test incoming pressure before calling a technician.

Can I install an RO system myself in Central Florida?

Standard 5-stage under-sink RO installations are within reach for homeowners comfortable with basic plumbing. The process involves cutting the cold supply line under the sink, connecting the pre-filters and membrane housing inline, running a drain saddle to the sink drain, mounting the storage tank, and installing the dedicated faucet through the sink. The trickiest part in a Central Florida well water application is confirming incoming pressure and TDS are within the system's operating range before installation.

Does my RO system need a water softener upstream in Central Florida?

Not strictly required, but strongly recommended. Floridan Aquifer water at 20 to 35 grains per gallon hardness will foul an RO membrane with calcium carbonate scale in 1 to 2 years. Softened water feeding the RO system extends membrane life to the standard 3 to 5 year range and reduces the frequency of pre-filter changes. The trade-off is system complexity and the ongoing salt cost of the softener. If softening the whole house is not on the plan, a small scale inhibitor cartridge upstream of the membrane is a partial mitigation.

What is the typical filter replacement schedule for a Central Florida RO system?

In Central Florida well water conditions with a softener and iron filter upstream, a typical maintenance schedule is: sediment pre-filter every 6 months, carbon block pre-filter every 6 months, membrane every 3 to 5 years, post-filter carbon polisher every 12 months, and storage tank sanitization every 12 months. Without a softener upstream, sediment and carbon pre-filters may need replacement every 3 to 4 months and membranes annually or more frequently.

Related water treatment resources

Well Water Filtration Guide Water Softener Installation Guide Iron and Sulfur Treatment Guide Well Pump Repair Guide Filtration System Repair Water Testing Service Maintenance Contracts Water Filtration Service