Filters and methods of filtering debris from fluid are detailed. A vortex of debris-laden fluid may be created within a filter, causing certain debris (including, for example, leaves) to settle therein. Some versions of the filters may include two stages, one having a perforated tube and a second having a generally frustoconically-shaped tube, which may or may not be perforated.
1. Apparatus for filtering leafy debris entrained in flowing water of a pool or spa, the apparatus comprising:
a. an inlet;
b. a first tube (i) defining (A) a first exterior, (B) a first interior region, and (C) a first maximum diameter and (ii) comprising first openings through which water may flow from the first exterior to the first interior region;
c. a second tube (i) defining (A) a second exterior around which water that flowed through the inlet but not through the first openings may flow, (B) a second interior region, and (C) at least one cross-sectional diameter less than the first maximum diameter and (ii) comprising; second openings through which water may flow from the second exterior to the second interior region;
d. an outlet in liquid communication with both the first and second interior regions; and
e. means for imparting spinning motion to water flowing through the inlet and around the first exterior.
2. Apparatus according to claim 1 further comprising a housing containing at least the second tube, the housing having an interior and defining a region between its interior and the second exterior in which leafy debris may accumulate for removal.
3. Apparatus according to claim 2 further comprising a lid attaching to the housing and comprising the inlet and the outlet.
4. Apparatus according to claim 3 in which the housing defines a width, further comprising a disc (i) positioned between the first and second tubes, (ii) defining a periphery, and (iii) having a size less than the width of the housing so as to create a gap between the periphery and the interior of the housing.
5. Apparatus according to claim 4 in which the disc is annular and the housing is generally cylindrical.
6. Apparatus according to claim 5 further comprising a base attached to the second tube.
7. Apparatus according to claim 1 in which the first openings are angled such that water must transit an acute angle from the first exterior to the first interior region.
8. Apparatus according to claim 1 in which the inlet is connected to an automatic pool cleaner and the outlet is connected to a pump.
9. Apparatus for filtering leafy debris entrained in flowing water of a pool or spa, the apparatus comprising:
a. an inlet;
b. a first tube (i) defining (A) an exterior and (B) an interior region and (ii) comprising openings through which water may flow from the exterior to the interior region;
c. an outlet in liquid communication with the interior region;
d. means for imparting spinning motion to water flowing through the inlet and around the exterior of the first tube;
e. a second tube;
f. a housing containing at least the second tube and having an interior;
g. a base defining a periphery; and
h. a pliable wiper attached to the base about its periphery and abutting the interior of the housing.
10. Apparatus according to claim 9 in which the housing has a floor and the base is configured for positioning adjacent the floor.
11. Apparatus according to claim 10 in which the first and second tubes and the base are removable from the housing as a unit.
12. Apparatus according to claim 11 in which the first and second tubes and the base are integrally formed.
13. Apparatus according to claim 12 in which the second tube is frustoconically shaped.
14. Apparatus according to claim 13 in which the first tube is generally cylindrically shaped.
15. Apparatus according to claim 14 in which the second tube is positioned below the first tube when the apparatus is upright.
16. Apparatus according to claim 15 in which the motion-imparting means comprises an inlet conduit configured to impact spiraling motion downward when the apparatus is upright.
17. Apparatus according to claim 16 further comprising a director configured such that water may spin downward between it and the exterior of the first tube.
18. A method of filtering leafy debris entrained in flowing water, comprising:
a. introducing debris-laden water into a filter;
b. imparting spinning motion to the water;
c. causing a first portion of the water to pass from the exterior to the interior region of a first tube having a first maximum diameter and thence to an outlet of the filter;
d. straining leafy debris from the first portion of the water as it passes from the exterior to the interior region of the first tube; and
e. causing a second portion of the water to (i) spin downward outside the exterior of the first tube, (ii) spin around a second tube having at least one cross-sectional diameter less than the first maximum diameter, and (iii) pass from the exterior to the interior of the second tube and thence to the outlet of the filter.