Filter apparatus with fluid bypass

1. An aquarium arrangement, comprising;

a) an aquarium containing aquarium water;

b) a filter arrangement positioned within the aquarium, the filter arrangement having a fully submerged inlet and an outlet, the filter arrangement including:

i) a filter housing having a filtration region and a bypass region;

ii) a filter cartridge positionable within the filter housing, the filter cartridge including filter media located primarily within the filtration region when the filter cartridge is positioned within the filter housing; and

iii) a volume of fluid located within the bypass region, the volume of fluid having a specific gravity different than that of the aquarium water flowing through the filter arrangement;

iv) wherein the bypass region is sealed such that the volume of fluid is trapped within the filter arrangement during operation of the aquarium arrangement.

2. The aquarium arrangement of claim 1 , wherein the bypass region is located above the filtration region.

3. The aquarium arrangement of claim 1 , wherein the bypass region is located below the filtration region.

4. The aquarium arrangement of claim 1 , wherein the filter arrangement further includes a submersible pump assembly interconnected to the filter housing.

5. The aquarium arrangement of claim 1 , wherein the volume of fluid has a specific gravity that is less than the specific gravity of the aquarium water flowing through the filter arrangement.

6. The aquarium arrangement of claim 1 , wherein water flows through the bypass region only when the filter cartridge becomes clogged.

7. The aquarium arrangement of claim 1 , wherein the outlet of the filter arrangement is fully submerged.

8. The aquarium arrangement of claim 1 , wherein water overflow through the bypass region of the filter housing, due to the filter cartridge becoming clogged, is controlled by migration of the volume of fluid, the migration resulting from a pressure differential between an upstream side and a downstream side of the clogged filter cartridge.

9. The aquarium arrangement of claim 1 , wherein the volume of fluid is air, and wherein the bypass region is air-tight such that the air is contained within the bypass region.

10. The aquarium arrangement of claim 1 , wherein the volume of fluid has a specific gravity that is greater than the specific gravity of the aquarium water flowing through the filter arrangement.

11. A filter arrangement for filtering a primary fluid, the filter arrangement comprising:

a) a filter housing having an upper region and a lower region;

b) a filter cartridge positionable within the filter housing, the filter cartridge having an upstream side and an opposite downstream side;

c) a submersible pump assembly interconnected to the filter housing; and

d) a bypass pathway located through one of the upper region and the lower region, the one region of the upper region and the lower region being sealed;

e) wherein flow through the bypass pathway is controlled by migration of a secondary fluid located in the one of the upper and lower regions, the secondary fluid being trapped within the filter arrangement during filtering operation, the secondary fluid being different than the primary fluid that passes through the filter housing, the migration resulting from a pressure differential between the upstream and downstream sides of the filter cartridge.

12. The filter arrangement of claim 11 , wherein the bypass pathway is located in the upper region of the filter housing.

13. The filter arrangement of claim 11 , wherein the bypass pathway is located in the lower region of the filter housing.

14. The filter arrangement of claim 11 , wherein the filter housing defines an inlet, the inlet being located below the bypass pathway.

15. The filter arrangement of claim 11 , wherein the filter housing defines an inlet, the inlet being located above the bypass pathway.

16. The filter arrangement of claim 11 , wherein the secondary fluid has a specific gravity that is less than the specific gravity of the primary fluid that passes through the filter housing during normal operation.

17. The aquarium arrangement of claim 16 , wherein the secondary fluid is air, and wherein the one region is air-tight such that the air is contained within the one region.

18. The aquarium arrangement of claim 11 , wherein the secondary fluid has a specific gravity that is greater than the specific gravity of the primary fluid that passes through the filter housing during normal operation.

19. An aquarium arrangement, comprising;

a) an aquarium containing aquarium water; and

b) a filter arrangement positioned within the aquarium, the filter arrangement having a fully submerged inlet and an outlet, the filter arrangement including:

i) a filter housing having a filtration region and a sealed bypass region located above the filtration region;

ii) a filter cartridge positionable within the filter housing, the filter cartridge including filter media located primarily within the filtration region when the filter cartridge is positioned within the filter housing; and

iii) a volume of air that is captured within the sealed bypass region and that does not vent to atmosphere during operation of the aquarium arrangement;

iv) wherein aquarium water overflows through the bypass region when the filter cartridge becomes clogged, the water overflow through the bypass region being controlled by migration of the volume of air, the migration resulting from a pressure differential between an upstream side and a downstream side of the clogged filter cartridge.

20. An aquarium arrangement, comprising;

a) an aquarium containing aquarium water;

b) a filter arrangement positioned within the aquarium, the filter arrangement having a fully submerged inlet and an outlet, the filter arrangement including:

i) a filter housing having a filtration region and a bypass region located below the filtration region;

ii) a filter cartridge positionable within the filter housing, the filter cartridge including filter media located primarily within the filtration region when the filter cartridge is positioned within the filter housing; and

iii) a volume of fluid located within the bypass region, the volume of fluid having a specific gravity different than that of the aquarium water flowing through the filter arrangement.

21. An aquarium arrangement, comprising;

a) an aquarium containing aquarium water;

b) a filter arrangement positioned within the aquarium, the filter arrangement having a fully submerged inlet and a fully submerged outlet, the filter arrangement including:

i) a filter housing having a filtration region and a bypass region;

ii) a filter cartridge positionable within the filter housing, the filter cartridge including filter media located primarily within the filtration region when the filter cartridge is positioned within the filter housing; and

iii) a volume of fluid located within the bypass region, the volume of fluid having a specific gravity different than that of the aquarium water flowing through the filter arrangement.

22. An aquarium arrangement, comprising;

a) an aquarium containing aquarium water;

b) a filter arrangement positioned within the aquarium, the filter arrangement having a fully submerged inlet and an outlet, the filter arrangement including:

i) a filter housing having a filtration region and a bypass region;

ii) a filter cartridge positionable within the filter housing, the filter cartridge including filter media located primarily within the filtration region when the filter cartridge is positioned within the filter housing; and

iii) a volume of fluid located within the bypass region, the volume of fluid having a specific gravity that is greater than the specific gravity of the aquarium water flowing through the filter arrangement.