3-Stage RO Filter Replacement Kit – 5 Micron Sediment & Carbon Block Pre-Filters

Maintain peak performance in your 3-stage reverse osmosis system with this straightforward, value-packed replacement kit from Osmotics. Tailored for our compact 3-stage domestic RO units, this bundle refreshes the essential pre-filtration stages—removing sediment, chlorine, and other contaminants before they reach the RO membrane, ensuring cleaner water output, better taste, and longer system life.

Ideal for basic home drinking water purification, small households, or as an economical entry into reverse osmosis. Buying the kit together saves compared to individual purchases and guarantees perfect compatibility—no surprises during installation.

What's Included

• 1 × 5 Micron Sediment Pre-Filter (10" × 2.5") — Traps visible and fine particles like dirt, sand, rust, silt, and sediment (>5 microns) to protect the RO membrane from clogging.
• 1 × Carbon Block Pre-Filter (10" × 2.5") — Effectively removes chlorine, chloramine, bad tastes/odours, organic chemicals, and pesticides—preventing chemical damage to the membrane and improving final water flavour.

Key Benefits

• Clearer, better-tasting water — Dual pre-filtration removes common tap water impurities for noticeably improved drinking quality.
• Protects your RO system — Fresh pre-filters extend the life of the downstream RO membrane (replace membrane separately every 2–3 years).
• Simple & affordable maintenance — Everything needed in one low-cost kit; quick DIY swap in under 30 minutes—no tools required.
• Great for UK homes — Handles typical municipal water issues like chlorine and sediment, making it a reliable choice for everyday pure water needs.

Compatibility

Designed for Osmotics 3-stage reverse osmosis systems (and most compatible setups with standard 10" housings). Does not include the RO membrane—monitor production rate and TDS, and replace the membrane separately as needed.

Recommended Replacement Schedule (adjust based on water quality, usage, and visual/flow checks)

• Sediment & Carbon Block pre-filters: Every 6–12 months (or sooner if you notice reduced flow, discoloured filters, or off-tastes). Replace more frequently in areas with high sediment, hard water, or heavy daily use.

Specifications

• Filter Size: Standard 2.5" × 10"
• Materials: Food-grade spun polypropylene (sediment), compressed activated carbon block
• Manufacturer: Osmotics
• Weight: 0.8 kg
• SKU: OS-3SFRK

This bestselling kit delivers reliable, no-fuss maintenance for your 3-stage system—keeping it efficient and your water pure. In stock with fast UK delivery (next-day options available). Pair with our RO membrane replacements for complete system care.