FILTERSORB CT®
INTRODUCTION
FILTERSORB® CT (Combine Treatment), a more efficient and simple treatment to prevent all kinds of scale.
FILTERSORB® CT combines the two types of FILTERSORB: the
FILTERSORB® SP3 and the FILTERSORB® SPA.
FILTERSORB® SP3 prevents cationic scale (based on positively charged ions) such as Calcium and Magnesium. The SPA prevents anionic scale (based on negatively charged ions)
such as Sulfates, Silicates and Phosphates (Calcium phosphate).
FILTERSORB® CT is an excellent choice for all residential, industrial, and commercial applications since it provides optimum scale prevention.
In addition, this combined technology results in very high efficiency and provides additional capacity to the system.
The FILTERSORB® SP3 and FILTERSORB® SPA combination is well
suited to treat water with hardness over 15 grains or permanent hardness over 250 mg of (Ca + Mg + SiO2 + SO4) is typically over 60 % of the total anions.
FILTERSORB® SPA is only available as a combined product with
FILTERSORB® SP3 (i.e. as part of FILTERSORB® CT ) and cannot be supplied separately.
The goal of the designer of a CT combined treatment system is to ensure that the correct water quality and quantity is delivered with optimized Tank and head and distributers. The optimum design depends on the relating importance of
water parameters.
FILTERSORB CT®
FEATURES
Scale Prevention
High Efficacy
Water Softener
100 % Efficiency
COMBINED
TREATMENT
Nucleation Assisted Crystallization
FILTERSORB® CT is a Nucleation and Exothermic Combination
The best way to treat both anions as well as cations in hard water which can provide safe treatment of scale with 100 times more power.
Nucleation
FILTERSORB® SP3 works in a process of nucleation in which the media absorbs cations from its surroundings in the form of crystal and release CO2 in the form of gas → splitting a gas molecule.
Exothermic
FILTERSORB® SPA is an exothermic process in which the media separates the anions (negatively charged) from positively charged cations in the form of ionic bonds on the surface called EXO (outside) on very strong positively charged beads.
Anions in Hard potable water
Scaling including corrosion and biofouling are all related to each other, As displayed in the figure. The precipitation of permanent hardness can only be inhibited by carbonate or No corrosion can take place if the alkalinity of water is 8 to 8.5.
Anions Scale Prevention
The two types of FILTERSORB® units are SP3 scale prevention and SPA anion scale prevention.
SP3 units prevent cationic scale based on positively charged ions such as calcium and magnesium
and with nucleation, it changes them into CaCO3 crystals.
SPA units prevent scale based on negatively charged ions such as sulfates, silicates and phosphates (Calcium phosphate).
FILTERSORB® CT : Mixed media units prevent scale of both cations and anions, both positively and negatively charged ions.In addition, it needs no regeneration, no chemical feed and no electrical valve head or wastewater outlet. FILTERSORB® CT is a continuous up-flow system, which can treat both:
Point-of-entry (POE)
Point-of-use (POU)
Treatment of Cations and Anions Total hardness
Due to differences between temporary hardness and permanent hardness that make up the total hardness in water, we have combined FILTERSORB® SP3 and FILTERSORB® SPA in a 50 : 50 mix. This configuration is described as FILTERSORB® CT . The 50% SP3 treats temporary hardness based on carbonate hardness and the 50% SPA treats for permanent hardness which is mostly based on sulfates and silicates.
FREQUENTLY ASKED
QUESTIONS
FILTERSORB® CT is a patented, combined treatment media system from Germany. It is a 50/50 mix of FILTERSORB® SP3 and FILTERSORB® SPA media designed to prevent scale by treating both cationic and anionic scale-forming ions in hard water simultaneously.
Unlike ion exchange softeners that use salt to replace scale-forming ions with sodium, FILTERSORB® CT is a salt-free, chemical-free process. It does not require regeneration, produces no wastewater, no electricity, and does not add sodium to the water, which can cause corrosion.
FILTERSORB® CT prevents a wide range of scale types:
- Cationic Scale: Caused by calcium (Ca²⁺) and magnesium (Mg²⁺) – temporary hardness (carbonates).
- Anionic Scale: Caused by sulfates (SO₄²⁻), silicates (SiO₄⁻), and phosphates (PO₄³⁻) – permanent hardness (non-carbonate hardness).
It uses two simultaneous physical processes:
- Nucleation (SP3):The negatively charged SP3 media attracts positive cations (Ca²⁺, Mg²⁺) and converts them into harmless, insoluble calcium carbonate (CaCO₃) crystals.
- Exothermic Reaction (SPA):The positively charged SPA media attracts and separates negative anions (SO₄²⁻, SiO₄⁻, PO₄³⁻), preventing them from forming hard, acid-resistant scales.
- No Salt, No Chemicals: Eliminates the need for salt bags and handling.
- No Wastewater: Produces no backwash brine, saving water.
- Low Maintenance: Runs for over 5 years without servicing in many applications.
- Preserves Beneficial Minerals: Does not remove healthy calcium and magnesium; only converts them.
- Corrosion Inhibition: Prevents scale, a primary cause of corrosion, and avoids adding corrosive sodium.
It is designed for both Point-of-Entry (POE) whole-house systems and Point-of-Use (POU) applications in:
- Residential Homes
- Commercial & Industrial Facilities
- Food & Beverage Industry (preserves water taste for coffee/tea)
No. The recommended up-flow system design requires no electricity, no control valves, and no backwashing, making it simple and energy-efficient.
The system uses an up-flow pressure vessel (stainless steel or fiberglass) filled with FILTERSORB® CT media mix. The design prioritizes a tall, narrow vessel for optimal fluidization. No support sand or gravel is needed. Contact us for system calculation support.
For preventive maintenance, especially if organic fouling is suspected, the media can be cleaned and sanitized with SORBEX™ cleaner. The dosing is 200 grams of SORBEX™ granules per liter of FILTERSORB® CT media.
The system is highly efficient. The formula for media volume is: Throughput (liters) ÷ 250. For example, to treat 1000 liters of water, you would need 4 liters of FILTERSORB® CT media.
No. FILTERSORB® SPA is only available as part of the combined FILTERSORB® CT product and cannot be supplied separately. The 50:50 mix is essential for treating both ion types.
Yes. This is a key advantage. While SP3 alone is best for temporary hardness, the combination with SPA in the CT formula is specifically designed to tackle the challenging scales formed by sulfates and silicates that constitute permanent hardness.
Yes, Filtersorb-CT® is certified to NSF/ANSI/CAN 61 for use in drinking water treatment systems. Available certification from Water Quality Association (WQA) and The International Association of Plumbing and Mechanical Officials (IAPMO).
FILTERSORB® CT is manufactured by Watch Water GmbH in Germany, a leader in developing innovative, non-chemical, and environmentally friendly water treatment solutions.
Drinking Water Treatment