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A third cylindrical chamber 44 having a smaller diameter than said second cylindrical chamber 34 joins the second cylindrical chamber to complete the central chamber 20 of the aerator body 14. The third chamber 44 is closed at the end opposite the second chamber 34 by a wall 35. A second threaded portion 46, removed from the first threaded portion 22 by some distance, is formed on the inside wall of the third cylindrical chamber 44. A water passage 47 is formed in the wall of the third cylindrical chamber 44. To the water opening 47 there is fused or integrally formed a water passage 48 in a pylon 16 to establish fluid communication between a water conduit 10 and the third chamber 44. The third chamber 44 receives a water channel portion 51 of the valve body. Fluid communication between the water channel portion 51 and the water passageway 48 is achieved when the opening 47 is aligned with an opening 49 formed in a cylindrical wall which defines the water channel portion 51 of the valve body. If any link in the ring is broken, the Ethernet ring will activate the backup path automatically (within 10ms) to ensure normal communication.

If the air valves can be opened when the water pump is operating but there is no flow out the outlet channel 62, then water will fill the aeration chambers 36 or 37 under the influence of the static water pressure P1 or P2. If the air valves of both aerators are left open, then the suction created by the aerator that has the water fully on can suck water from the aeration chamber of the first valve into the air manifold and cause the air passageways to conduct water, thereby destroying the effectiveness of the aerator. FIGS. 4-7 are symbolic diagrams illustrating the interaction between the air and water passageways in the spa jet aerator body and the corresponding passageways in the valve for various angular positions of the valve. In FIGS. 4-7 this relationship is shown in terms of the triangular air hole 58 moving a distance D1 from point A in FIG. 4 to point B in FIG. 7. During the same angular rotation, the hole 49 moves a distance D2 from point C in FIG. 4 to point D in FIG. 7, a distance D2, said distance D2 being less than the distance D1.

Referring to FIG. 3 there is shown a typical ganged installation of several aerators, of which aerators 66 and 68 are typical, arranged around the perimeter of a spa 70. The air conduits 12 of the aerators 66 and 68 are joined to a manifold 72. The manifold 72 can be vented to the atmosphere at a level above the water level in the spa 70 or can be coupled to the output of a blower (not shown). While they are capable of removing low levels of iron, they may not be as effective in removing higher levels of iron from water. However, an oxidizer may not actually remove the iron from the water, meaning it will still need to be filtered or vacuumed out. However, the relations of water-consuming and therefore wastewater generating and application of sewage treatment facilities will change. Land application include slow-rate systems, rapid infiltration, subsurface infiltration, overland flow.

Members left to door open to the department to amend the scheme (with covers over the tanks) or the application would be refused. 1 and 2) in the aerator body 14 leading from the water conduits 10 to the third chamber 44. The triangles at the left in FIGS. In FIGS. 4-7 the circles on the left represent the water passageways 48 and openings 47 (in FIGS. At all points in the movement between FIGS. 4-7 as vertical movement of the triangular-shaped holes 49 and 58 while the circular water and air passageways 48 and 42 remain stationary. The first section 21 has the largest diameter and is defined by a circular wall 23 with a threaded portion 22 on the inside wall of the chamber. The directional nozzle 52 is attached to a ball element 60 which has a diameter sufficient to approximately match the inside diameter of the cylindrical wall 50. The ball has a fluid passage 62 formed therein for an outlet channel. Because the air valve of the aerator 66 is open, the suction in the aeration chamber of the aerator 66 will be coupled through the manifold 72 to the aeration chamber of the aerator 68 through the open air valve of the aerator 68. But because the aeration chamber of the aerator 68 is filled with water because of insufficient opening of the water valve of the aerator 68 to create outflow through the outlet aperture flow channel 62, this water from the aeration chamber 36 will be sucked into the air manifold 72. This will block free air flow through the manifold 72 to the other aerators on the circuit and will flow into the aeration chamber 37 of the aerator 66 and cause it to stop aerating.

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