6-Stage Pre-Filter Only Replacement Kit – Sediment, Carbon Block & GAC Pre-Filters

Extend the life of your 6-stage reverse osmosis system without a full overhaul—choose this targeted pre-filter only replacement kit from Osmotics. Specially designed for our 6-stage RO/RODI units and the OS-PP Drinking Water System, this kit refreshes the first three critical pre-filtration stages: sediment removal plus dual carbon protection (block + granulated) to eliminate chlorine, chemicals, organics, and odours before they reach your RO membrane.

This is the perfect, cost-effective option when your pre-filters need changing (common every 6–12 months) but your RO membrane and post-filter are still performing well. It prevents premature membrane fouling, maintains high flow rates and rejection efficiency, and keeps your water tasting fresh—all without replacing higher-cost components. Save money and reduce waste compared to buying a complete 6-stage kit.

What's Included

• 1 × 5 Micron Sediment Pre-Filter (10" × 2.5") — Traps dirt, sand, rust, silt, and particles larger than 5 microns to protect downstream stages from clogging.
• 1 × Carbon Block Pre-Filter (10" × 2.5") — Removes chlorine, chloramine, VOCs, pesticides, bad tastes/odours, and organic contaminants; safeguards the RO membrane from chemical attack.
• 1 × Granulated Activated Carbon (GAC) Pre-Filter (10" × 2.5") — Provides additional broad-spectrum adsorption of chemicals, organics, and tastes/odours—enhancing overall pre-filtration in 6-stage systems for superior protection and water quality.

Key Benefits

• Targeted maintenance — Refresh only the pre-filters that wear out fastest, extending RO membrane life (typically 2–3 years) and saving on full-kit costs.
• Enhanced protection & taste — Triple pre-filtration (sediment + dual carbon) delivers cleaner feed water to the RO stage, reducing fouling and improving final purity/taste.
• Easy & economical — One-box solution; simple DIY installation in minutes—no tools or system disassembly beyond the pre-filter housings.
• Ideal for UK users — Handles common issues like chlorinated municipal water, sediment from older pipes, or variable tap quality in homes with 6-stage or OS-PP systems.

Compatibility

Fits Osmotics 6-stage reverse osmosis systems and the OS-PP Drinking Water System (standard 10" housings). This kit includes pre-filters only—does not include the RO membrane, DI resin, or inline post-carbon pod. Use alongside our full 6-stage kit or individual replacements as needed.

Recommended Replacement Schedule (adjust for your water quality, usage volume, and monitoring)

• All pre-filters (Sediment, Carbon Block, GAC): Every 6–12 months (or sooner if flow rate drops, filters appear discoloured, or tastes/odours return). Replace more frequently in high-sediment, high-chlorine, or heavy-use scenarios to maintain optimal system performance.

Specifications

• Filter Size: Standard 2.5" × 10"
• Materials: Food-grade spun polypropylene (sediment), extruded/activated carbon block, premium granulated activated carbon (GAC)
• Manufacturer: Osmotics
• Weight: 1.45 kg
• SKU: OS-6SPFRK

This smart kit is a favourite for savvy Osmotics owners who monitor their system and prefer phased maintenance—reliable, great-value, and backed by our expertise in pure water solutions. In stock with fast UK delivery (next-day options available). Combine with our RO membrane or DI resin refills for complete care when the time comes.