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Why Fragtastic is the Best!

Fragtastic Reef is a REAL store with REAL Customer Service. Shopping online can be frustrating not knowing who is selling out of their basement or garage. Fragtastic Reef is one of the very few REAL fish stores that also sells online, and has a FULL Brick and Motar Retail Store! We not only have a full retail location but also a warehouse with massive selection of inventory in stock, and you can even pickup at our retail location.

Most products on our website are in stock and shipped by us from our retail location.

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You can finally stop waiting on hold with those other online vendors. Fragtastic Reef is open 7 DAYS A WEEK - Because we care about your success and your tank!

10" MATRIKX Carbon Block

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Product Description

10" Matrikx Carbon Blocks - CTO & CTO+

Kx Technologies MATRIKX brand carbon blocks are the most trusted and widely used carbon blocks in the world.  They outperform every other brand we have tested or reviewed. The 10” size is the industry standard and will fit our systems as well as virtually every brand of RO system that use similar looking carbon blocks.

Most common filter arrangements

  • If your system utilizes one carbon block we recommend installing the 5 Micron CTO in the second stage after your sediment filter.*
  • If your system utilizes two carbon blocks we recommend installing the 5 micron CTO in the second stage after your sediment filter and the 0.6 micron CTO Plus in the third stage.

*You may use a 0.6 micron CTO PLUS in a single block arrangement however depending on pre-filtration and sediment content of your home's water, it may clog faster than you would like.

Matrikx CTO 5 Micron Carbon Block

  • Most widely used carbon block in the world
  • NSF Certified and WQA Gold Seal Certified
  • Manufactured using FDA-compliant materials
  • Optimized for chlorine and organic chemical treatment
  • 5 Micron rated filter – Nominal*
  • 10 Micron – Absolute**
  • Rated for 6,000 of water @ 1/GPM***


Matrikx CTO PLUS 0.6 Micron Carbon Block

  • High volatile organic compounds (VOC) reduction
  • High chemical adsorptive capacity
  • NSF Certified and WQA Gold Seal Certified
  • Manufactured using FDA-compliant materials
  • Optimized for chlorine and organic chemical treatment
  • 0.6 Micron rated filter – Nominal*
  • 2 Micron – Absolute**
  • Rated for 20,000 of water @ 1/GPM***


*Nominal rating will remove >85% of particulate of given size from water with single pass filtration

**Absolute rating will remove >99.9% of particulate given size from water with single pass filtration

*** This is a total of all water processed and includes product water as well as waste water. If you find you are not getting the full life out of the carbon block it is likely due to a large volume of sediment in your homes water supply.  Please try our ROSAVE.Z premium line of sediment filters for optimal performance.

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Limited Time - FREE SHIPPING ON ALL ORDERS OVER $29! Most orders will ship the same or next business day of when you place the order. We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Almost all items on are website qualify for FLAT RATE or FREE shipping! Order over $29 in products and receive FREE shipping on your order.

International Shipping & Orders

We ship Worldwide everyday. Please contact us for shipping quotes and availability on any products you would like to purchase.

International orders do NOT qualify for free shipping, please contact us for a shipping quote.

We only accept Paypal as payment for international orders and customers and must ship to a confirmed address.

Product Warranty

EVERY ITEM WE SELL IS BRAND NEW & COMES WITH A FULL MANUFACTURE WARRANTY! We do not sell used, defective, or returned product to our customers. Only exception to this is in our clearance and open box section of our website. Even those items still include a full warranty, and are usually an amazing deal if your looking to save money!

Most brands and products we sell have typically a 1 year warranty, with some products having up to 3 or more years. If you have any questions on warranties you can check the manufacture website or just contact us with any questions. At we sell only the best products, and only products we recommend and use ourselves, so you can buy with confidence.

We are an authorized dealer and retail partner for every brand we sell!

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