Reverse osmosis filter replacement: stages, schedule, cost
Reverse osmosis filter replacement is not one job but three on different clocks: the sediment and carbon prefilters change most often, the membrane lasts years when the prefilters are kept fresh, and the final polishing filter changes with the membrane or on its own schedule. Skipping the prefilters is what kills membranes early. The table below shows current replacement filter and service pricing from verified vendors so you can budget the system's real running cost.
- median advertised water softener system price
- $1,531
- brands with a verified published price
- 9
- system types with measured demand
- 8
Figures on this page come from The Water Hub System Pricing Index: 9 brands with a verified published price, median advertised softener system $1,531, checked against each brand's own product page.
- 9 brand product pages verifiedevery figure matched verbatim to the brand's page
- Quoted and dated, never estimatedlast verification pass 2026-08-19
- 8 system types coveredeach with measured search demand behind it
Advertised prices, verified
| Brand | Softener system | Reverse osmosis | Whole-house filter | Source |
|---|---|---|---|---|
| Express Water | $550/system | $207/system | $498/system | brand product page |
| APEC Water Systems | $582/system | $231/system | $399/system | brand product page |
| AquaSure | $630/system | $190/system | $800/system | brand product page |
| US Water Systems | $1,395/system | $649/system | $979/system | brand product page |
| Crystal Quest | $1,531/system | $478/system | $1,791/system | brand product page |
| iSpring | $1,559/system | $231/system | $517/system | brand product page |
| SpringWell | $1,607/system | $364/system | $1,160/system | brand product page |
| Aquasana | $1,698/system | $450/system | $1,998/system | brand product page |
| Waterdrop | $2,499/system | $439/system | $270/system | brand product page |
| Culligan | No published price; quote-based (checked August 2026) | |||
| Kinetico | No published price; quote-based (checked August 2026) | |||
| Pentair | No published price; quote-based (checked August 2026) | |||
| Tier1 Water | No published price; quote-based (checked August 2026) |
Replacing RO filters in the right order
- Shut down and depressurize. Close the feed valve and the tank valve, then open the RO faucet until flow stops so the housings are not under pressure. Put a towel and a shallow pan under the unit: some water always remains in the housings and the drain line when you open them.
- Change prefilters and postfilter. Swap the sediment and carbon prefilters on the maker's schedule, checking each O-ring as you go. Quick-change systems twist out as sealed cartridges instead. Change the polishing postfilter too if it is due, since it is the last thing the water touches before your glass.
- Change the membrane only when due. The membrane lives in its own horizontal housing and needs replacing far less often than the prefilters. Falling production, a tank that never fills, or a creeping taste change with fresh prefilters installed are the practical signs it is finished.
- Sanitize, repressurize and flush. Sanitize the system per the manual when it is open anyway, reopen the valves, then discard the first full tank or two of water. Carbon fines and preservative from a new membrane belong down the drain, not in your drinking water or the ice maker.
OEM cartridges, generics and service plans
Standard-size housings accept filters from many makers, which keeps replacement cost low and is a real argument for choosing a standard-format system in the first place. Quick-change and tankless systems use proprietary cartridges, so their replacement pricing belongs in your buying decision, not as a surprise in year two.
A service plan from a local dealer bundles the filters and the visit, which suits owners who will not remember the schedule. Doing it yourself takes under an hour with a filter wrench, and our reverse osmosis systems comparison covers which designs make the swap easiest before you commit to one.
Whichever route you take, write the date on each new filter. An RO unit fails quietly: the water still flows while the carbon is exhausted and the membrane strains, so a dated housing is your only honest maintenance record.
Common questions
- What happens if I never change my RO filters?
- The prefilters clog and exhaust, chlorine reaches and damages the membrane, production slows, and eventually the water quality quietly returns toward tap water while everything still appears to work.
- Do I need a technician to replace RO filters?
- Not for a standard under-sink unit: it is a hand-tools job most owners handle. A whole-house RO or a unit with a booster pump and remineralizer is more sensible as a scheduled service visit.
- What does a full set of replacement filters cost?
- It varies with the system format, and proprietary cartridges cost more than standard sizes. The live table on this page tracks vendor pricing; the median replacement set sits at $1,531.
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Cite or embed this figure
The median advertised water softener system price in the US water treatment market was $1,531 in August 2026, across 9 verified brand product pages recorded in The Water Hub System Pricing Index.
Cite as: "The Water Hub System Pricing Index", updated 2026-08-19, https://thewaterhub.org/reverse-osmosis-filter-replacement/.