CTO – Coconut-Based Activated Carbon Block Water Filter Cartridge
 
Effective drinking water filtration – up to 10,000 litres of cleaner, fresher and better-tasting water.
 
The CTO is a high-performance, 10-inch coconut-based activated carbon block cartridge designed to reduce a wide range of unwanted substances in drinking water.
Using advanced activated carbon technology, the cartridge helps reduce selected PFAS compounds, pesticides, chlorine, microplastics, organic chemicals and other potential impurities while retaining naturally occurring minerals.
 
With a filtration capacity of up to 10,000 litres, a water flow of 6–8 litres per minute and an affordable replacement cost, the CTO provides a practical and economical solution for everyday household drinking water filtration.
 
Effective Filtration for Cleaner Drinking Water
 
The CTO uses compressed, coconut-based activated carbon with an extensive internal surface area.
As water passes through the carbon block, many organic substances are adsorbed onto the activated carbon, while the compact structure also acts as a physical barrier against particles.
 
Helps reduce:
 
PFAS compounds – including selected types such as PFOS, PFOA and PFNA
Pesticides and herbicides – selected agricultural chemicals and residues
Chlorine and chloramines – helping improve the taste and smell of tap water
Disinfection by-products – including selected trihalomethanes (THMs)
VOCs and organic chemicals – selected solvents and other organic contaminants
Pharmaceutical residues – selected medicines and micropollutants
Selected heavy metals – depending on the specific contaminant
Microplastics and fine particles
Sand, rust and sediment
Hydrogen sulphide and unwanted taste and odour
 
Unlike reverse osmosis, activated carbon filtration retains naturally occurring dissolved minerals such as calcium and magnesium.
 
Better-Tasting Water for Everyday Use
 
Chlorine and certain organic compounds can affect the taste and smell of tap water.
By reducing these substances, the CTO helps provide fresher and more pleasant-tasting water for drinking, coffee, tea and cooking.
 
The cartridge is designed to maintain a high water flow, making it suitable for everyday use without significantly restricting the normal flow from your kitchen tap.
 
Reliable Filtration – Up to 10,000 Litres
The CTO combines effective carbon block filtration with convenient maintenance and low replacement costs.
 
Recommended replacement intervals:
 
Chlorinated water: Maximum 12 months
Non-chlorinated water: Maximum 6 months
Filtration capacity: Up to 10,000 litres
 
The cartridge should be replaced when either the maximum filtration capacity or the recommended service interval is reached, whichever comes first.
The shorter replacement interval in non-chlorinated water helps reduce the risk of bacterial growth within the cartridge.
Actual service life may vary depending on water quality, consumption and operating conditions.
 
Quality Materials and Easy Replacement
 
The CTO is manufactured using food-grade materials and is designed for use in compatible standard 10-inch water filter housings.
Its coconut-based activated carbon block provides effective filtration without removing the water's naturally occurring dissolved minerals.
The cartridge is suitable for Holmblad's Ecoline CTO filtration system and other 10" compatible filter housings.
 
CTO – Reliable carbon block filtration, great-tasting drinking water and affordable everyday protection.