One media for temporary and permanent hardness
FILTERSORB® CT is a factory-prepared combined scale-prevention media designed to address carbonate scale together with more difficult sulfate-, silicate- and phosphate-related deposits.
Developed by Watch Water® Germany, FILTERSORB® CT combines FILTERSORB® SP3 and FILTERSORB® SPA in a 50:50 media blend[cite: 3]. The SP3 component applies Nucleation Assisted Crystallization to transform calcium- and magnesium-related carbonate hardness into stable microcrystals[cite: 3]. The SPA component is designed to control scale involving negatively charged species such as sulfates, silicates and phosphates[cite: 3]. Together, the two media provide broader protection for residential, commercial, municipal and industrial water systems without salt regeneration, chemical dosing or brine wastewater[cite: 3].
Dual-action scale prevention without salt or regeneration[cite: 3].
50% SP3 for carbonate hardness. 50% SPA for permanent-hardness scale[cite: 3].
Comprehensive scale protection
across water systems
FILTERSORB® CT is intended for applications where both carbonate hardness and non-carbonate scale-forming species are present[cite: 3]. It can be configured for point-of-use, point-of-entry and larger commercial or industrial treatment systems.
Residential and Whole-House Systems
Protects household plumbing, water heaters, shower systems, appliances and point-of-entry installations.
Hotels, Restaurants and Food Service
Suitable for hotels, commercial kitchens, coffee and tea equipment, ice machines and catering systems.
Commercial and Institutional Buildings
Supports scale prevention in offices, hospitals, schools, public facilities and commercial hot-water systems.
Boilers and Heating Equipment
Helps protect boilers, hot-water generators, heating elements and heat-transfer surfaces from complex mineral deposits.
Cooling and Industrial Process Water
Suitable for cooling equipment, manufacturing, process-water systems and applications affected by sulfate and silicate scale.
Food, Beverage and Specialty Water
Preserves the natural mineral profile used for coffee, tea and beverage preparation while supporting broader scale control.
Four advantages engineered into one combined media
Carbonate Hardness Transformation
The SP3 component provides catalytic nucleation sites that transform calcium- and magnesium-related carbonate hardness into suspended calcium-carbonate microcrystals
Protection Against Difficult Permanent-Hardness Scale
The SPA component provides positively charged active surfaces intended to interfere with scale formation involving sulfates, silicates and phosphates.
Scale Prevention Without Sodium Exchange
FILTERSORB® CT is not a conventional ion-exchange softener. It does not intentionally replace calcium and magnesium with sodium.
No Regeneration, Brine or Electrical Valve
The recommended continuous-upflow configuration requires no salt regeneration, chemical feed, routine regeneration backwashing or electrical control valve.
Science &
Technology
FILTERSORB® CT combines two different media surfaces to address the two major categories of scale-forming water chemistry: temporary carbonate hardness and permanent non-carbonate hardness[cite: 3].
- NAC Treatment with SP3 – FILTERSORB® SP3 initiates calcium-carbonate nucleation. Dissolved calcium bicarbonate is transformed into calcium-carbonate microcrystals that are intended to remain suspended rather than forming hard surface deposits.
- Anion-Scale Control with SPA – FILTERSORB® SPA uses positively charged active surfaces designed to interact with negatively charged scale-forming species, including sulfate, silicate and phosphate.
- 50:50 Combined Media Configuration – FILTERSORB® CT is supplied as an equal mixture of SP3 and SPA[cite: 3]. The SP3 fraction addresses temporary carbonate hardness, while the SPA fraction targets permanent-hardness scale.
- Continuous Upflow Fluidization – The media is designed for upflow operation with sufficient freeboard and water distribution to support media movement, contact and controlled pressure drop.
Explore the FILTERSORB® CT
Poster Library
Frequently
Asked Questions
Find answers about FILTERSORB® CT, combined scale prevention, installation, maintenance and system sizing[cite: 3].
Contact SupportCalculate Your FILTERSORB® CT System
Determine the estimated media volume using the formula: Required Throughput (L) ÷ 250.
Sizing Recommendation
Get a Combined Scale-Prevention Solution
It all starts with complete water chemistry.
Send us your water analysis, flow requirements and equipment details. Our technical team can evaluate temporary hardness, permanent hardness, sulfate, silica and phosphate to determine whether FILTERSORB® CT is appropriate[cite: 3].
