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OPRO600-PCT Filters for Tankless RO Water Purifier

$74.00

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OnlyPure PCT + Alkaline Filter Replacement Pre-Carbon & Mineral Enhancement Filtration for Tankless Reverse Osmosis Systems Maintain optimal performance of your reverse osmosis system with the OnlyPure PCT + Alkaline Replacement Filter. This multi-stage cartridge combines sediment filtration, activated carbon purification, and... Read more

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OnlyPure PCT + Alkaline Filter Replacement

Pre-Carbon & Mineral Enhancement Filtration for Tankless Reverse Osmosis Systems

Maintain optimal performance of your reverse osmosis system with the OnlyPure PCT + Alkaline Replacement Filter. This multi-stage cartridge combines sediment filtration, activated carbon purification, and alkaline mineral enhancement to improve water quality and taste.

The PCT filter acts as the first stage of filtration, reducing chlorine, sediment, and impurities before water reaches the RO membrane, while the alkaline mineral stage adds back balanced minerals for improved taste.


Multi-Layer Filtration Technology

The OnlyPure PCT + Alkaline filter uses a multi-layer filtration structure:

Cotton sediment layer – captures rust, sand, and particles
Activated carbon fiber – reduces chlorine, taste and odor
Carbon rod layer – improves water clarity and protects the RO membrane
Alkaline mineral layer – adds beneficial minerals such as calcium and magnesium to enhance taste

This combination provides effective pre-filtration and mineral balance for refreshing drinking water.


Improves Water Taste & Mineral Balance

The alkaline stage helps restore balanced mineral content often removed during reverse osmosis filtration.

Benefits include:

✔ Improved water taste
✔ Balanced mineral composition
✔ Fresh, smooth drinking water
✔ Support for everyday hydration

The mineral levels added are similar to natural mineral water.


Reduces Common Tap Water Impurities

The PCT filtration stage helps reduce:

  • Chlorine

  • Sediment

  • Rust particles

  • Sand and suspended solids

  • Unpleasant taste and odor

This stage helps protect the RO membrane and extend its lifespan.


Compatible Systems

Designed for OnlyPure OPRO600-RO tankless reverse osmosis systems and compatible with select 600 GPD tankless RO systems including:

  • Mist MRO003 4-Stage Carbon Block Under Sink Water Filtration System

  • SimpliPure Genesis SPG-600 Tankless RO System

  • Aquacubed A8 Tankless Reverse Osmosis System

  • Crystal Water Products TRO-600

  • ICEPURE Tankless RO System

  • NAVIEN WUR500 Tankless RO System

  • Eiger Direct Flow RO Reverse Osmosis Water Filtration System

  • VELTRA A8 Alkaline Reverse Osmosis Under-Sink Water Filter

Always confirm compatibility with your system before purchase.


Filter Life

Recommended replacement interval:

6 – 12 months

Filter lifespan depends on:

  • water quality

  • daily water consumption

  • sediment levels in tap water

Replacing the filter regularly ensures consistent performance and fresh-tasting water.


Easy Twist-Lock Installation

✔ Twist-lock cartridge design
✔ No tools required
✔ Replacement in minutes

This design makes maintenance simple for homeowners.


Key Features

✔ Multi-layer cotton & carbon filtration
✔ Reduces chlorine, sediment and odor
Alkaline mineral enhancement for improved taste
✔ Designed for 600 GPD tankless RO systems
✔ Protects RO membrane and system performance

Enjoy clean, refreshing, mineral-balanced water every day with the OnlyPure PCT + Alkaline replacement filter.

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Return & Refund Policy

This Return & Refund Policy applies to all products sold on www.onlypurefilter.com, including water filtration systems, tankless reverse osmosis systems, countertop systems, water filter pitchers, refrigerator filters, replacement filters, and accessories.

1. 30-Day Return Window

You may request a return within 30 days of delivery for eligible products.

2. Condition of Returned Items (All Products)

To be eligible for a return, all products must meet the following conditions:

  • The item is unused and uninstalled

  • The item has not been connected to any water source or used with water

  • The item is returned in original, undamaged, resalable condition and packaging

  • All original accessories, manuals, parts, and components are included

For health, safety, and hygiene reasons, any product that has been installed, used, or exposed to water is non-returnable and non-refundable.

3. Product Categories & Hygiene Notice

Many OnlyPure products are hygiene-sensitive (including filtration systems, pitchers, filters, cartridges, and components that contact drinking water). Once opened and/or installed, these products cannot be resold and therefore cannot be returned.

Returns for these products are accepted only if they are new, unused, and in original sealed packaging.

4. Compatibility & Incorrect Orders

Customers are responsible for verifying product compatibility before purchase. OnlyPure replacement filters and system components are designed for compatibility with OnlyPure systems only, unless otherwise stated on the product page.

If an item is ordered incorrectly or for a non-compatible system:

  • Returns may be accepted only if the product is unused and in original condition

  • Return shipping costs are the customer’s responsibility

  • Original shipping charges (if any) are non-refundable

5. Return Shipping

  • If the return is due to customer preference, incorrect order, or compatibility issues, return shipping costs are the customer’s responsibility.

  • If the return is due to our error (wrong item shipped) or a confirmed manufacturing defect, OnlyPure will cover return shipping or provide a replacement at no additional cost.

6. Inspection & Approval

All returned items are inspected upon receipt. OnlyPure reserves the right to refuse returns or issue partial refunds if:

  • The product shows signs of installation, use, or water exposure

  • Packaging is damaged, missing, or incomplete

  • Parts, accessories, or components are missing

7. Refund Processing

Once your return is received and approved, refunds will be issued to the original payment method within 5–10 business days. Refunds apply to the product price only. Shipping and handling fees are non-refundable unless the return is due to our error.

8. Damaged, Defective, or Incorrect Items

If your order arrives damaged, defective, or incorrect, please contact us within 48 hours of delivery with clear photos of the product and packaging. We will arrange a replacement or refund as appropriate.

9. Non-Returnable Items

The following are non-returnable once opened or installed:

  • Any filtration system, pitcher, filter, cartridge, or component that has been installed or used

  • Any product exposed to water

  • Clearance or final-sale items

10. How to Request a Return

To initiate a return, contact our support team at:

📧 info@onlypurefilter.com

Please include your order number and reason for return. Return authorization is required before sending items back. Unauthorized returns may be refused.

Thanks 

Customer Team 

CUSTOMER REVIEWS

Customer Reviews

Based on 2 reviews
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M
Mark Stocker
Fits mist m3 filter. Performance as expected

Fits mist m3 filter. Performance as expected

M
Michael R.
Easy Replacement and Great Taste

I replaced the PCT + alkaline filter in my tankless RO system and the difference was noticeable right away. The water tastes fresh and smooth, and installation only took a few minutes. The twist-lock design makes it very easy to change. Great quality replacement filter.

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