Specifically designed to provide mineral scale prevention &
corrosion control in high temperature and high hardness applications.

(SFES) manufactures HydroBlend® systems containing an NSF certified drinking water additive* that effectively controls mineral scale deposits in plumbing systems and water-fed equipment. Unlike standard polyphosphates, HydroBlend is specifically formulated to work in high-temperature / high-hardness environments providing unparalleled mineral scale prevention and corrosion control.

HydroBlend protects equipment by the following processes


HydroBlend sequesters (binds) with scale-causing minerals making them more soluble in water thus reducing the chances of precipitation as hard mineral scale.

In the event that scale causing minerals do precipitate out of solution, HydroBlend prevents mineral scale accumulation by distorting the shape of the scale crystal so that it cannot build up on itself.

By combining with scale-causing minerals, HydroBlend provides corrosion control by forming a protective micro-thin glass-like lining on wetted surfaces acting as a deterrent to corrosion and scale.

Overtime, HydroBlend will also help soften and remove existing mineral scale deposits.
HydroBlend is utilized in a solid block cartridge form, exposing to the water a predetermined fixed surface area, from which accurate feed rates can be predicted. HydroBlend systems consist of Media Delivery Heads (Flow-Thru or Standard Filter heads) that are paired with various cartridge designs based on water flow rates, line size, and other usage characteristics. Unlike standard polyphosphate treatment, HydroBlend Systems allow various configurations to meet most treatment requirements with the goal of obtaining proper feed rates for desired treatment volumes.
HydroBlend Systems provide effective scale prevention and corrosion control for various applications at a fraction of the cost and maintenance of other technologies. As a ‘threshold treatment”, HydroBlend Systems are specified based on water usage and flow rates, not water hardness, so there is no added expense with harder water. When the cartridge has dissolved, it is replaced. A quick glance at the clear or translucent housing indicates when cartridge replacement is needed – no electricity, drain lines, maintenance or guess work is required.

HydroBlend feed systems ensure that the product feed rates are consistent over predictable time periods. HydroBlend products are available in various configurations allowing its application to many different processes.

There is no dumping when the product sits overnight. No electricity, drain, or guess work is required. A quick glance at the clear housing will indicate when cartridge replacement is needed.


Polyphosphates have been used in the prevention of mineral scale and corrosion control for many decades, mostly in municipal systems to protect water distribution lines. While they exhibit some effectiveness at low temperatures in water conditions that are not too hard, they fail to provide adequate scale control when temperatures exceed 90°F. This was first noted in the 1945 patent filed by Charles S. King describing the crystal. He states that the crystals totally revert when temperatures exceed 90° F which explains the poor results that are obtained in using these products in hot water applications.

Glassy Phosphates

Generally used in the form of small round beads often referred to as SlowPhos.  SlowPhos is added to cartridges and housings and dissolves as water comes in contact.  Like standard polyphosphates, this product has high hardness and hot water limitations making its use mostly for ice machines.


A polyphosphate based product where silica is used as a caking agent in order to regulate the rate at which the product dissolves. Similar to standard polyphosphates, Siliphos looses its effectiveness in high hardness and high temperature applications. The silica that is used in the product may also leave a silica scale deposits in certain equipment processes.

HydroBlend Feed Systems

How standard polyphosphates are added into the water supply will vary according to the type of product used.  SlowPhos and Siliphos are usually added into prefilter housing sumps or inside cartridges and are dissolved as the water passes through the system.  The main problem with this type of design is the lack of consistent feed rates. It is also difficult to predict the dissolution rates of polyphosphate over varying flow rates.

HydroBlend feed systems are unique as they control how much product is exposed to water by controlling the surface area where water comes in contact with the HydroBlend product.  This ensures that the feed rates are constant as the surface area of the product exposed to the water is also constant.  Unlike with traditional feed systems, HydroBlend systems do not “dump” when there is no water usage for extended time periods.