Systems and methods for water filtration

1. A point-of-use countertop water filtration system, comprising:

a support base;

a first receptacle detachably disposed on the support base and configured to store source water, the first receptacle comprising an outlet port and an inlet port;

a second receptacle detachably disposed on the support base and configured to store supply water, the second receptacle comprising an inlet port; and

a filter system disposed between the first receptacle and the second receptacle, the filter system comprising

an inlet port, a first outlet port, and a second outlet port,

a first filter comprising a sediment filter or a combination of a sediment filter and a carbon filter,

a second filter comprising a reverse osmosis membrane, and

a third filter comprising a carbon filter,

wherein the first filter is configured and disposed to receive water from the inlet port of the filter system and to filter and deliver first filtered water to the second filter,

wherein the second filter is configured and disposed to receive the first filtered water from the first filter, to deliver a first portion of the first filtered water to the first outlet port of the filter system, the first portion of the first filtered water being waste water that is delivered back to the first receptacle, and to filter and deliver a second portion of the first filtered water, the second portion of the first filtered water being second filtered water,

wherein the third filter is disposed between the second filter and the second receptacle and is configured to receive the second filtered water from the second filter and to filter and deliver third filtered water to the second outlet port of the filter system;

wherein, when the first and second receptacles are attached to the support base, the outlet port of the first receptacle is disposed in fluid communication with the inlet port of the filter system, the first outlet port of the filter system is disposed in fluid communication with the inlet port of the first receptacle, and the second outlet port of the filter system is disposed in fluid communication with the inlet port of the second receptacle.

2. The water filtration system of claim 1 , wherein:

the first receptacle further comprises a fill opening configured to receive source water; and

the second receptacle further comprises a dispense opening configured to deliver supply water to a user.

3. The water filtration system of claim 2 , wherein:

the first receptacle further comprises an openable lid configured to open and close access to the fill opening; and

the second receptacle further comprises a dispense actuator configured to open and close access to the dispense opening.

4. The water filtration system of claim 1 , wherein:

100% of the water that enters the first filter passes to the second filter;

less than 100% of the water that enters the second filter passes to the third filter; and

100% of the water that enters the third filter passes to the second receptacle.

5. The water filtration system of claim 1 , wherein:

about 1% to about 30% of the water that enters the second filter passes to the third filter, with remaining water constituting the waste water that is delivered back to the first receptacle.

6. The water filtration system of claim 1 , further comprising:

a flow restrictor disposed between and in fluid communication with the first outlet port of the filter system and the inlet port of the first receptacle, the flow restrictor being set to create a back pressure on the second filter that enables the second portion of the first filtered water to pass through the second filter to produce the second filtered water.

7. The water filtration system of claim 6 , further comprising:

a return check valve disposed between and in fluid communication with the flow restrictor and the inlet port of the first receptacle, the return check valve being configured to prevent water flow from the first receptacle to the reverse osmosis membrane.

8. The water filtration system of claim 1 , further comprising:

a forward check valve disposed between and in fluid communication with the second outlet port of the filter system and the inlet port of the second receptacle, the forward check valve being configured to prevent water flow from the second receptacle to the filter system.

9. The water filtration system of claim 1 , further comprising:

a pump disposed between and in fluid communication with the outlet port of the first receptacle and the inlet port of the filter system.

10. The water filtration system of claim 9 , wherein the pump is automatically primed by the fluid flow from the outlet port of the first receptacle to the pump being configured to be gravity fed.

11. The water filtration system of claim 9 , wherein the pump is the sole source for generating hydraulic pressure that facilitates fluid flow from the first receptacle through the filter system to the second receptacle, and that facilitates fluid flow from the first receptacle through only a portion of the filter system back to the first receptacle via a flow restrictor.

12. The water filtration system of claim 1 , wherein the filter system comprises:

a filter base comprising the inlet port, the first outlet port, and the second outlet port,

wherein the first filter, the second filter, and the third filter are disposed on top of and attached to a top portion of the filter base;

wherein the outlet port of the first receptacle is disposed in fluid communication with the inlet port of the filter system, wherein the first outlet port of the filter system is disposed in fluid communication with the inlet port of the first receptacle, and wherein the second outlet port of the filter system is disposed in fluid communication with the inlet port of the second receptacle.

13. A point-of-use countertop water filtration system, comprising:

a support base;

a first receptacle disposed on the support base and configured to store source water, the first receptacle comprising an outlet port and an inlet port;

a second receptacle disposed on the support base and configured to store supply water, the second receptacle comprising an inlet port; and

a filter system disposed between the first receptacle and the second receptacle, the filter system comprising

an inlet port, a first outlet port, and a second outlet port,

a sediment and/or carbon filter,

an RO filter, and

a carbon filter,

wherein the sediment and/or carbon filter is configured and disposed to receive water from the inlet port of the filter system and to filter and deliver first filtered water to the RO filter,

wherein the RO filter is configured and disposed to receive the first filtered water from the sediment and/or carbon filter, to deliver a first portion of the first filtered water to the first outlet port of the filter system, the first portion of the first filtered water being waste water that is delivered back to the first receptacle, and to filter and deliver a second portion of the first filtered water, the second portion of the first filtered water being second filtered water,

wherein the carbon filter is disposed between the RO filter and the second receptacle and is configured to receive the second filtered water from the RO filter and to filter and deliver third filtered water to the second outlet port of the filter system;

wherein the outlet port of the first receptacle is disposed in fluid communication with the inlet port of the filter system, the first outlet port of the filter system is disposed in fluid communication with the inlet port of the first receptacle, and the second outlet port of the filter system is disposed in fluid communication with the inlet port of the second receptacle.

14. A point-of-use countertop water filtration system, comprising:

a support base;

a first receptacle disposed on the support base and configured to store source water;

a second receptacle disposed on the support base and configured to store supply water; and

a filter system disposed between the first receptacle and the second receptacle, the filter system comprising

sediment and/or carbon filters,

an RO filter, and

a carbon filter,

wherein the sediment and/or carbon filters are configured to filter and deliver first filtered water to the RO filter,

wherein the RO filter is configured and disposed to receive the first filtered water from the sediment and/or carbon filters, to deliver a first portion of the first filtered water to the first receptacle, the first portion of the first filtered water being waste water that is delivered back to the first receptacle, and to filter and deliver a second portion of the first filtered water, the second portion of the first filtered water being second filtered water,

wherein the carbon filter is disposed between the RO filter and the second receptacle and is configured to receive the second filtered water from the RO filter and to filter and deliver third filtered water to the second receptacle.