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US 6,605,211 B1Granted
One-piece underdrain for swimming pool filters
AssigneeJacuzzi Leisure Products
InventorHerbert N. Slopack
Life of this patent
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AssigneeJacuzzi Leisure Products
InventorHerbert N. Slopack
Estimating the term…
The present invention relates to pool filters. An underdrain design is disclosed that primarily relies on a peripheral ring rather than lateral projections to transfer the water to the sand. The ends of the ring are not joined so that the ring is not closed. The ring is also bent into a helical shape which allows the ring to be screwed into an opening with a smaller diameter than that of the ring. The ring is radially slotted so that water flows radially from it in all directions both toward the center of the tank and away from the center, as well as straight up and down. Since the water transfer takes place primarily along an arc located relatively near the mid-point between the center and the perimeter of the tank, the disadvantages inherent in the concentration of the water flow at the center of the tank are eliminated.
A filtering system for a pool comprising:
An improved sand filter comprising:
An improved sand filter comprising:
An improved method for inserting an underdrain into an opening of reduced diameter in one end of a sand filter tank, comprising:
In a pool filtering system comprising:
Dependencies are inferred from the claim text.