Apparatus for dosing powdered or granulated additives in water works, namely swimming pools

An apparatus for dosing a powdered or granulated additive in a water works, comprising a dosing assembly (10) hydraulically connected to said works, and means (3) for containing said additive, capable of conveying said additive towards said dosing assembly (10), said dosing assembly comprising:

• water collecting means (19) hydraulically connected to at least one inflow (20, 21) of unmixed water and to at least one outflow (33) of additive-mixed water;
• means (24, 25) for controlling said water inflow;
• pump means (34) for supplying water through said outflow;
• and
• means (11) for delivering said additive from said containing means (3) towards said water collecting means (19), said dosing assembly also comprising a manifold (18) arranged over said water collecting means (19) and over a means (31) for tapping said unmixed water from said inflow to said manifold (18), the manifold comprising a lower, narrower tubular section (27a), communicating with said water collecting means (19) and an upper, wider tubular section (27b), within which said lower section (27a) partially coaxially extends, so that between the two sections an annular hollow space (28) is defined, said tapping means (31) being hydraulically connected with said hollow space (28), said manifold (18) further comprising an upper, open bottom cup-shaped body (29), into which said additive is discharged from above, said body being fitted within said lower section (27a) so as to defined in cooperation therewith an annular meatus (30), whereby said additive mixes with water flowing through said meatus (30), and additive mixed water is discharged into said collecting means (19).