Hi-Tech Vietnam CTO Activated Carbon Block Filter – 10 Inch 3rd Stage Cartridge for RO Water Filter in Pakistan

Hi-Tech Vietnam CTO Activated Carbon Block Filter for RO Water Filters

The Hi-Tech Vietnam CTO is a 10 inch activated carbon block filter for the 3rd stage of a domestic RO water filter. It sits after the sediment filter and the GAC filter, and it is the last pre-filter before the RO membrane. It removes the chlorine, organic compounds and odour the earlier stages leave behind, and it protects the membrane from clogging residues.

Hi-Tech is a Vietnam-made brand that Axtron Pakistan supplies alongside the Axtron and Classic Pure ranges. The cartridge is a standard 10 inch size, so it fits almost every domestic RO plant in Pakistan, whatever the brand.

What Is Printed on the Hi-Tech CTO Label

These details come directly from the product label.

Features (as printed)

• Removes chlorine, surplus organic compounds and the odour they cause in water
• Protects RO membranes from clogging residues

Specifications (as printed)

• Compositions: coal and dechlorination material
• Maximum flow: 100 L/H
• Use pressure: 5 bars

Other Label Details

• Product: CTO carbon block filter
• Note: wash (flush) before the water goes into the RO membrane
• Markings printed on the label: NSF, ISO 14001:2015, Water Quality Association and ISO 9001:2015 logos
• Made in Vietnam

Why “Wash Before Water Goes Into the RO Membrane” Matters

A new carbon block can release fine black carbon dust. After fitting the cartridge, let water run through it to drain for a few minutes until it comes out clear, before it reaches the membrane. This keeps carbon fines off the membrane surface.

What CTO Means and How the Carbon Block Works

CTO stands for Chlorine, Taste and Odour. Unlike a GAC filter, which holds loose carbon granules, a CTO is carbon compressed into a solid block. Water passes slowly through a dense carbon wall, giving a finer, more even treatment. That is why the CTO is placed right before the membrane, as the final pre-filter stage.

Where the Hi-Tech CTO Sits in Your RO Plant

1. PPF sediment filter: removes sand, mud and rust. See the Hi-Tech Vietnam PPF sediment filter.
2. GAC filter: removes most of the chlorine and smell. See the Hi-Tech Vietnam GAC UDF filter.
3. CTO carbon block (this product): second carbon stage; membrane protection.
4. RO membrane: the main purification stage.
5. Post-membrane stages: post carbon, mineral, nano silver, alkaline or others. These can be changed or rearranged to suit your water quality and needs.

Hi-Tech Vietnam CTO Specifications

Hi-Tech CTO vs Other CTO Filters at Axtron

All three fit the same 10 inch housing. Each brand’s details are on its own page, so you can compare before you order.

When to Replace the Hi-Tech CTO Filter

From our field experience servicing RO plants:

• Replace the CTO every 3 months at most. Once the carbon is used up, it stops removing chlorine and can start giving the water a smell.
• Change the GAC at the same time. It follows the same 3-month cycle.
• Change the PPF every 15–30 days, or when it turns fully brown or dark. A late PPF change sends dirt into the carbon stages and shortens their life.
• RO plant left unused for some time? Replace all cartridges before using it again. Stale water inside the housings causes smell, and dried cartridges don’t perform properly.

Fresh pre-filters on time help the RO membrane last its normal life of about 1 year. Late pre-filter changes, high TDS and long running hours shorten it.

How to Replace the CTO Filter

1. Close the water inlet and switch off the RO plant.
2. Open the faucet to release pressure.
3. Unscrew the 3rd stage housing with a housing spanner.
4. Remove the old cartridge and wash the inside of the housing.
5. Check that the O-ring is seated properly, then fit the new Hi-Tech CTO.
6. Flush water to drain until it runs clear before it goes to the membrane, as the label advises.

Who Should Use the Hi-Tech CTO Filter

• Homes with a domestic RO plant that uses standard 10 inch housings
• Homes on chlorinated tap water or bore water with a smell
• Anyone doing the regular 3-month pre-filter change

A carbon block does not reduce hardness. In areas with very hard bore water, such as many parts of Multan and South Punjab, ask us about adding a cation resin softening cartridge to protect the membrane.

For a full 3-month change in one order, see the Axtron RO filter set for 3 months or the Classic Pure RO filter set. All cartridges are listed under domestic filters.

Buy the Hi-Tech CTO Filter in Multan, Lahore, Bahawalpur and Across Pakistan

You can buy the Hi-Tech CTO at any Axtron branch or order online with cash on delivery anywhere in Pakistan.

Multan (Head Office)
5FP4+CXF, Akbar Road, Tipu Sultan Colony, Multan 60000
Phone: 0302-1635555 · 0300-4773040 · 061-4544442

Lahore
91-A Feroz Pur Road, Lahore
Phone: 0304-8205829 · 042-37502222

Bahawalpur
Opposite Sadiq Public School, Ahmad Pur East Road, Bahawalpur
Phone: 0302-7401250 · 062-2201005

Contact
Timings: Saturday to Thursday, 10:00 AM – 7:00 PM (Friday closed)
Email: info@axtronpakistan.com
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Installation and service

• Multan, Lahore and Bahawalpur: Axtron’s own technicians can change your filters (service charges are paid to Axtron).
• Other cities: we connect you on WhatsApp with an independent local technician. The technician quotes and collects payment directly. They are not Axtron staff, and Axtron is not responsible for their work.

Looking for a complete system? See our water filter in Multan and RO plant in Lahore pages.

Frequently Asked Questions

What does the Hi-Tech Vietnam CTO filter remove?

As printed on the label, it removes chlorine, surplus organic compounds and the odour they cause, and protects the RO membrane from clogging residues.

What are the Hi-Tech CTO specifications?

The label lists coal and dechlorination material as the composition, a maximum flow of 100 L/H and a use pressure of 5 bars. It is a 10 inch carbon block, made in Vietnam.

Which stage is the CTO filter installed in?

The 3rd stage, after the PPF sediment filter and the GAC filter, just before the RO membrane.

How often should I replace the Hi-Tech CTO?

Every 3 months at most, together with the GAC. Old carbon stops working and can make the water smell.

Why does the label say to wash it before water goes into the membrane?

New carbon blocks release fine carbon dust. Run water through the new cartridge to drain until it comes out clear. This keeps the dust off the membrane.

Will it fit my RO plant?

Yes, if your RO plant uses standard 10 inch housings, as almost all domestic RO plants in Pakistan do.

Where can I buy the Hi-Tech CTO filter in Multan?

At our head office on Akbar Road, Tipu Sultan Colony, Multan. Call 0302-1635555 or 061-4544442. Our Multan technicians can also fit it at your home.

Do you deliver to Lahore, Karachi and other cities?

Yes. We deliver across Pakistan with cash on delivery. In Lahore you can also visit our Feroz Pur Road branch.