Filter Kit FK-101 for PT-4.0/5 5-Stage RO System

Filter Kit FK-101 for PT-4.0/5 5-Stage RO System

FK-101 Filter Kit is the complete annual replacement filter set designed specifically for the Vertex PT-4.0/5 5-Stage Reverse Osmosis System. This kit replaces all pre- and post-filters (RO membrane not included) to maintain optimal water quality and system performance.

Overview

The FK-101 is engineered for the PT-4.0/5 36 GPD 5-stage residential RO system that uses standard 2.5” × 10” vertical filter housings.

This kit restores filtration performance, improves taste and odor reduction, and helps protect your RO membrane from premature fouling.

Note: This kit does not include the RO membrane. For membrane replacement, see model MA-4202 (36 GPD).

Filter Stages

• Stage 1: 5-micron Sediment Filter (SF-4007) – Removes dirt, rust, and suspended solids.
• Stage 2: Carbon Block Filter (CF-4142) – Reduces chlorine, taste, and odor.
• Stage 3: Carbon Block Filter (CF-4142) – Additional chlorine and chemical reduction.
• Stage 5: Inline GAC Post Filter (IF-4103) – Final taste polishing before dispensing.

RO membrane (MA-4202) sold separately.

Strict Compatibility

Compatible ONLY with:

• Vertex PT-4.0/5 5-Stage RO System
• Other Vertex 5-stage residential RO systems using 2.5” × 10” standard housings

Not compatible with:

• PT-4.0 (4-stage) systems — use FK-100 instead
• IsoTwist models
• GreenMachine systems
• EasyPur twist-on systems
• Any Vertex PWC water cooler models

If you are unsure which system you own, please contact us with your model number before ordering.

Specifications

• System Type: 5-stage residential reverse osmosis
• Filter Size: 2.5” × 10” standard housings
• Membrane: Not included (36 GPD MA-4202)
• Recommended Replacement Cycle: Every 6–12 months

Includes

• 1 × Sediment Filter (SF-4007)
• 2 × Carbon Block Filters (CF-4142)
• 1 × Inline GAC Post Filter (IF-4103)
• Replacement O-rings
• Filter housing removal wrench
• Installation instructions