One kit. Five+ systems. Pure water again.
A universal pre-filter replacement set engineered to fit the most popular under-sink reverse osmosis systems — iSpring, APEC, Olympia, and Krystal Pure. Two coconut-shell carbon blocks and one 5-micron sediment filter. Same fit as OEM, smarter price.
Built to fit the systems you already own
Standard 10" × 2.5" slim-line cartridges drop directly into housings used by every major under-sink RO brand. No adapters, no modifications.
iSpring
RCC7AK and other RCC-series systems using 10" × 2.5" pre-filters.
APEC Water
ROES-50, ROES-PH75, RO-90, and other Essence and Ultimate series.
Olympia Water
OROS-50 and other Olympia under-sink reverse osmosis systems.
Krystal Pure
KR10 and KR15 reverse osmosis systems — stages 1, 2, and 3.
Express Water
Standard ROALK and RO5 series using 10" × 2.5" pre-filters.
+ Universal
Any under-sink RO system that uses standard 10" × 2.5" slim-line cartridges.
Not sure if these fit your system?
Pull one of your current pre-filters and measure. If it's roughly 9.75–10 inches tall and 2.5 inches in diameter, this kit fits. Almost every residential under-sink RO system built in the last 20 years uses this standard slim-line size.
Three filters. One easy refresh.
Replaces the three pre-treatment stages found in nearly every residential RO system — the workhorses that protect your membrane and polish your drinking water.
5-Micron Polypropylene Sediment Filter
Catches rust, sand, silt, and visible particles before they reach the carbon stages — the first line of defense that extends the life of every filter downstream.
Coconut Shell Carbon Block Filters
Two high-capacity 5-micron carbon blocks reduce chlorine taste and odor, organic compounds, and particulates — protecting your RO membrane and polishing the final product water.
How your RO system cleans water
This kit handles the three pre-treatment stages — the filtration that prepares water before it ever reaches the RO membrane.
Sediment
5-micron PP traps rust, silt, sand & debris.
Carbon Block
Coconut carbon reduces chlorine taste & odor.
Carbon Polish
Second carbon stage protects the RO membrane.
Better water. Longer membrane life.
Protects the RO Membrane
Chlorine destroys thin-film composite membranes. Fresh carbon blocks remove it before it ever reaches the membrane stage — significantly extending its service life.
Crisp, Clean Taste
Reduces chlorine, organics, and the off-flavors that make tap water unpleasant — without stripping the beneficial minerals you actually want to keep.
Better for the Planet
One filter change replaces hundreds of single-use plastic bottles. Lower waste, lower cost per gallon, no more grocery-store water runs.
The details, on paper
Your RO replacement schedule
Most under-sink reverse osmosis systems follow the same maintenance rhythm. Here's what your system needs — and when.
Pre-Filters (This Kit)
Sediment and carbon block pre-treatment. Replace twice a year, or sooner if you notice slower flow or off-tastes returning.
RO Membrane
The heart of the system. With diligent pre-filter changes, your membrane should last 2 to 3 years of household use.
Post-Carbon Polish
The final touch before water reaches your faucet. Annual replacement keeps every glass tasting fresh.
