Calcium and magnesium are naturally contained in the water of domestic water systems. During the heating of the water, a chemical encrustation process occurs: the calcium bicarbonate precipitates and settles on the heat exchange surfaces of the hot water production system.
To prevent this problem and on the recommendation of various national standards and by boiler manufacturers, it is necessary to install a proportional dosing unit. This will prevent the build-up of scale but also corrosion by dosing a food grade chemical solution which will not alter the potability of the water according to the Commission Directive 98/83/EC and its latest amendments 2015/1787/EC.
A proportional polyphosphates dosing unit uses the Venturi effect to work. It reduces the fluid pressure that results when a fluid flows through a constricted section of the pipe guaranteeing a direct proportional quantity of the chemical solution allowing it protect the system from lime-scale deposits.
A constant dosage allows the polyphosphates concentration to remain within the limits permitted by the regulations and at the same time to keep its anti-scale and anti-corrosive properties active.
The dosing unit is ideal for use with gas / electric boilers, and water heaters.
DOSPRO dosing unit is equipped with a floating red sphere that – once it reaches the bottom of the bowl – will indicate the solution has depleted and must be refilled with two new tabs. DOSPRO is the only dosing unit with a proportional double control dosing system, Vortex and Venturi.
The DOSTABS tablets consumption is proportional to the water usage. The refill life of 80 m³ is influenced by the temperature, frequency of use and by the sampling frequency. DOSTABS blister contains 6 tabs, suitable for a one-year protection of an average domestic system.
No moving parts and less prone to breakage
Constant and continuous dosage
DOSTABS are supplied already compressed, not diluted with water. The powder dissolves and becomes a liquid solution before being injected, ensuring a longer life.
Dosage starts as soon as hot sanitary water is required from any tap of the system
Moving piston with mechanical intermittent operation which is prone to crystallization formation that interrupts the protection of the system and the boiler
Dosage uses a pre-mixed liquid solution that has shorter life
Dosage starts from a few litres of hot sanitary water, at least 3L/min
Magnetic scale inhibitors work by preventing and/or reducing scale formation by applying static magnetic fields to water. These devices are tested by law to ensure their compatibility with biological parameters and therefore that they are not harmful to humans.
Health compatibility does not imply an effectiveness of these devices, whose anti-scaling and descaling efficiency has not yet been widely proved outside science labs. The application of this scale-inhibiting effect to specific systems is in fact very difficult because:
Neither of these two requirements takes place inside a domestic hot water production system.