Vertex FK-101 | 5-Stage RO Purifier Annual Filter Kit

For Vertex PureWaterMachine PT4.0/5

Reverse Osmosis Water Purifier

Vertex FK - 101 | 5 - Stage RO Purifier Annual Filter Kit - Pure n Natural Systems

Vertex FK-101 | 5-Stage RO Purifier Annual Filter Kit

For Vertex PureWaterMachine PT4.0/5

Reverse Osmosis Water Purifier

$69.95
Stage 5 Option:

Stage 5 Option

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About this product

Annual Filter Kit for Vertex PureWaterMachine PT4.0/5 Reverse Osmosis Water Purifier

Filter kit includes:

  • (1) 5 micron Sediment Filter (stage 1)
  • (2) Activated Carbon Block Filters (stages 2 & 3)
  • (1) Granular Activated Carbon filter - OR (1) - GAC/Calcite Filter (stage 5)
  • (1) Filter Wrench
  • (2) "O" Rings
  • (1) Instruction Manual

(RO Membrane sold separately)

For use in the Vertex PT-4.0/5 5-Stage Undercounter Reverse Osmosis System

Best for
  • Scheduled annual maintenance of PT4.0/5 RO systems
  • Facilities and technicians who want reliable water filtration performance
  • Grow rooms, labs, and commercial spaces needing clean, filtered water
  • Businesses that follow preventative maintenance best practices
  • Users who need all required replacement filters in one convenient kit

Specifications

What's in the box

Filter kit includes:

  • (1) 5 micron Sediment Filter (stage 1)
  • (2) Activated Carbon Block Filters (stages 2 & 3)
  • (1) Granular Activated Carbon filter - OR (1) - GAC/Calcite Filter (stage 5)
  • (1) Filter Wrench
  • (2) "O" Rings
  • (1) Instruction Manual

(RO Membrane sold separately)

Installation tips
  • Turn Off Water Supply: Before replacing filters, shut off the water supply to the RO system
  • Relieve Pressure: Open the RO faucet or drain pressure from the system before servicing
  • Follow Sequence: Replace filters in the order outlined: sediment first, then carbon, then membrane
  • Check O-rings: Inspect and lightly lubricate O-rings before reinstalling housings to ensure seals
  • Tighten Correctly: Hand-tighten RO housings to avoid leaks — avoid over-tightening
  • Flush After Install: Run system for a few minutes to flush new filters before regular use
  • Record Date: Mark the date of replacement to plan the next annual change

Frequently asked questions

What is the Vertex FK-101 filter kit?
The Vertex FK-101 is an annual replacement filter kit designed for routine maintenance of Vertex PT4.0/5 reverse osmosis systems.

Which systems does the Vertex FK-101 serve?
This filter kit is specifically designed to service Vertex PT4.0/5 RO systems.

Why should these filters be replaced annually?
Annual replacement helps maintain proper water flow, filtration efficiency, and overall system performance while reducing buildup and fouling.

Can I install the Vertex FK-101 filters myself?
Yes. Filter replacement is user-serviceable with basic tools by following the included instructions.

Do I need to shut off the water before replacing the filters?
Yes. Always shut off the feed water and relieve system pressure before replacing filters.

How long should I flush the system after installation?
After installation, flush the system for several minutes to clear air and any loose media before normal use.

Does this kit include the RO system?
No. This is a replacement filter kit only. The RO system is sold separately.

How often should I replace this kit?
Once per year under normal operating conditions, or sooner if water quality or usage demands it.
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