Exchangeable media filter
A filter element for a pool or spa including a sintered plastic outer cylinder of a first diameter, a sintered plastic inner cylinder of a second diameter less than said first diameter; the inner cylinder being position coaxially with respect to the outer cylinder to define an annular interior chamber; and a selected granulated filter medium or combination of media residing in the annular interior chamber.
1. Apparatus comprising:
a portable spa or tub;
a filter compartment in said spa or tub;
a filter element positioned in said filter compartment, the filter element comprising:
a sintered plastic outer cylinder of a first diameter;
a sintered plastic inner cylinder of a second diameter less than said first diameter; the inner cylinder being position coaxially with respect to the outer cylinder to define an annular interior chamber; and
a selected granulated filter medium or combination of granulated filter media residing in said annular chamber.
2. The filter element of claim 1 further comprising a screw-on top cap threadable into and out of said filter whereby the cap may be removed and the filter media replaced.
3. The filter element of claim 1 further comprising a press-fitted top cap engaging the inner and outer cylinders.
4. A filter element for a pool or spa comprising:
an outer cylinder of a first diameter;
an inner cylinder of a second diameter less than said first diameter; the inner cylinder being position coaxially with respect to the outer cylinder to define an annular interior chamber; and
a porous donut-shaped bag containing a filter medium or combination of selected filter media, said donut-shaped bag residing in said annular interior chamber.
5. The filter element of claim 4 wherein the outer cylinder comprises sintered plastic.
6. The filter element of claim 5 wherein the inner cylinder comprises a mesh material.
7. The filter element of claim 4 wherein the inner cylinder comprises a mesh material.
8. The filter element of claim 4 wherein the donut shaped bag has a hook formed at an upper end thereof, said hook adapted to hook over a top edge of said inner cylinder.
9. Apparatus comprising:
a portable spa or tub;
a filter compartment in said spa or tub;
a filter element positioned in said filter compartment, the filter element comprising:
a plastic outer cylinder of a first diameter;
an inner cylinder of a second diameter less than said first diameter; the inner cylinder being position coaxially with respect to the outer cylinder to define an annular interior chamber; and
a porous donut shaped bag containing a selected granular or beaded filter medium or combination of selected granular and/or beaded filter media and residing in said annular chamber.
10. The filter element of claim 9 wherein the outer cylinder comprises sintered plastic.
11. The filter element of claim 10 wherein the inner cylinder comprises a mesh material.
12. The filter element of claim 9 wherein the inner cylinder comprises a mesh material.
13. The filter element of claim 9 wherein the donut shaped bag has a hook formed at an upper end thereof, said hook adapted to hook over a top edge of said inner cylinder.
14. Apparatus comprising:
a portable spa or tub;
a filter compartment in said spa or tub;
a filter element positioned in said filter compartment, the filter element comprising:
a sintered plastic outer cylinder of a first diameter;
a sintered plastic inner cylinder of a second diameter less than said first diameter; the inner cylinder being position coaxially with respect to the outer cylinder to define an annular interior chamber; and
a selected granulated and/or beaded filter medium or combination of selected granulated and/or beaded filter media residing in said annular chamber.