MATRIKX CTO Carbon Block Filter - 20" Jumbo 4.5", 5 or 1 Micron, PFAS and Chloramine Reduction NZ

The highest capacity MATRIKX carbon block — for Jumbo (Big Blue) 20" x 4.5" housings, with exceptional service life between replacements. The MATRIKX CTO range offers two carbon block options in the Jumbo 20" size. Select your variant using the dropdown above. CTO — 5 micron nominal. Reduces chlorine, PFAS, and chloramine. CTO Plus — 1 micron nominal. Reduces chlorine, PFAS, chloramine, and VOCs. The 20" Jumbo combines the largest diameter (4.5") with the longest length, delivering the highest chlorine reduction capacity in the MATRIKX range — over 193,000 litres for the CTO and over 912,000 litres for the CTO Plus. Suited to high-demand whole-house installations, large homes, farms, and commercial applications. Both are made from 100% coconut shell activated carbon — a renewable material — and manufactured in an ISO 9001 and ISO 14001 certified facility. Certified for sustainability by WQA (S-803). NSF and WQA certified for material safety. Important: these filters must be used only with microbiologically safe and adequately disinfected water. They are not a substitute for disinfection. All performance figures are manufacturer-stated based on internal and independent laboratory testing. NSF/ANSI 42 and WQA Standard 42 certifications cover material safety requirements only. Which variant do I need? Variant Micron Best suited to CTO 5 micron nominal Maximum-capacity chlorine, PFAS and chloramine reduction at very high flow. Large whole-house systems, farms, and high-demand installations. CTO Plus 1 micron nominal All CTO performance plus VOC reduction and finer particulate filtration. Highest capacity carbon block in the MATRIKX range. Key specs at a glance Specification CTO (5 micron) CTO Plus (1 micron) Micron rating 5 nominal 1 nominal Chlorine reduction capacity >193,000L @ 26.6 L/min >912,000L @ 26.6 L/min PFAS reduction capacity >73,800L @ 11.4 L/min >79,400L @ 11.4 L/min Chloramine reduction capacity >22,800L @ 11.4 L/min >45,500L @ 11.4 L/min VOC reduction capacity Not applicable >17,000L @ 7.6 L/min Pressure drop 7 psid @ 7 gpm 7 psid @ 7 gpm Part number 32-450-20-MATRIKX 01-450-20-MATRIKX All capacity figures are manufacturer-stated. Actual performance depends on influent water quality, flow rate, and system design. Shared specifications Specification Detail Size 4½" x 20" (114mm x 508mm) Housing compatibility Standard Jumbo 20" open sump housings (4.5" diameter) Material 100% coconut shell activated carbon Min operating temperature 4°C Max operating temperature 52°C Min operating pressure 1.38 bar (20 psig) Max operating pressure 17 bar (250 psig) Max differential pressure 6.895 bar (100 psid) Certifications NSF/ANSI 42 and WQA Standard 42 — material safety | WQA S-803 sustainability Facility ISO 9001 and ISO 14001 certified California Prop. 65 Compliant Water requirement Microbiologically safe, adequately disinfected water only What's in the box 1 x MATRIKX carbon block cartridge (variant as selected) Frequently asked questions What is the difference between CTO and CTO Plus? CTO is a 5 micron nominal carbon block that reduces chlorine, PFAS, and chloramine. CTO Plus is a 1 micron nominal carbon block that does all of this and also reduces VOCs. The CTO Plus 20" Jumbo has an exceptionally high chlorine reduction capacity — over 912,000 litres at 26.6 L/min. If you need VOC reduction or finer filtration, choose CTO Plus. For maximum-flow chlorine, PFAS, and chloramine reduction, CTO is the right choice. What does NSF/ANSI 42 certification mean for these filters? On the MATRIKX CTO and CTO Plus, NSF/ANSI 42 certification — from both NSF International and WQA — covers material safety requirements only. It confirms the materials in contact with drinking water are safe. It does not certify the performance claims. Those figures are manufacturer-stated based on internal and independent laboratory testing. What is PFAS and does this filter reduce it? PFAS (per- and polyfluoroalkyl substances) are a group of synthetic chemicals found in some water supplies. The manufacturer states PFAS reduction capacity of >73,800 litres at 11.4 L/min for the CTO and >79,400 litres at 11.4 L/min for the CTO Plus, based on >95% reduction at 1500 ppt. Does it reduce chloramine? Yes — both CTO and CTO Plus reduce chloramine. The manufacturer states >83% reduction at 3ppm, with stated capacities shown in the spec table above. Why choose the 20" Jumbo over the 10" Jumbo? Double the length means roughly double the carbon media, which translates to significantly longer service life between replacements and higher capacity at any given flow rate. If you're running a high-demand whole-house system and want to minimise how often you change cartridges, the 20" Jumbo is the better investment. Can I use these filters with tank or bore water? Only if the water supply is microbiologically safe and adequately disinfected. These carbon blocks are not a disinfection device. If your tank or bore water is not disinfected, you need a UV system or other disinfection method upstream of or alongside this filter. Will it fit my existing housing? The 20" Jumbo size fits industry-standard Jumbo (Big Blue) 20" open sump housings with a 4.5" internal diameter. If you're unsure about housing compatibility, check your housing dimensions before ordering. How often should I replace it? Replacement depends on water quality, flow rate, and usage. The 20" Jumbo has the highest capacity in the range — service life between replacements will be substantially longer than smaller sizes. Replace when chlorine taste or odour returns, or when flow drops noticeably. Flush the cartridge after installation before use.