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A UV liquid treatment system comprises least one UV treatment unit including a unit container having a container interior; a liquid distribution head carried by the unit container; at least one liquid inlet passage in the liquid distribution head and disposed in fluid communication with the unit con

A UV liquid treatment system comprises least one UV treatment unit including a unit container having a container interior; a liquid distribution head carried by the unit container; at least one liquid inlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container; at least one liquid outlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container; a transparent light bulb shield carried by the liquid distribution head and having a shield interior; an assembly cavity in the liquid distribution head and communicating with the shield interior of the light bulb shield; a UV light assembly having a UV light bulb removably seated in the assembly cavity, the UV light bulb disposed in the shield interior of the light bulb shield; and a power source electrically connected to the UV light bulb of the UV light assembly.

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1. A UV liquid treatment system, comprising: at least one UV treatment unit including: a unit container having a container sidewall, a container bottom extending from the container sidewall and a container interior formed by and between the container sidewall and the container bottom;a liquid distri

1. A UV liquid treatment system, comprising: at least one UV treatment unit including: a unit container having a container sidewall, a container bottom extending from the container sidewall and a container interior formed by and between the container sidewall and the container bottom;a liquid distribution head carried by the unit container;at least one liquid inlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container;at least one liquid outlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container, the at least one liquid inlet passage and the at least one liquid outlet passage disposed generally in 180-degree relationship to each other on opposite sides of the liquid distribution head;a transparent light bulb shield carried by the liquid distribution head and having a shield interior;a descending liquid flow passage formed by and between the light bulb shield and the container sidewall of the unit container, the descending liquid flow passage disposed in fluid communication with the at least one liquid inlet passage;a transition space formed by and between the light bulb shield and the container bottom of the unit container, the transition space disposed in fluid communication with the descending liquid flow passage;an ascending liquid flow passage formed by and between the light bulb shield and the container sidewall of the unit container, the ascending liquid flow passage disposed in fluid communication with the transition space and the at least one liquid outlet passage;an assembly cavity in the liquid distribution head and communicating with the shield interior of the light bulb shield;a UV light assembly having a UV light bulb removably seated in the assembly cavity, the UV light bulb disposed in the shield interior of the light bulb shield; anda power source electrically connected to the UV light bulb of the UV light assembly. 2. The UV liquid treatment system of claim 1 wherein the UV light assembly comprises a receptacle plug seated in the assembly cavity and wherein the UV light bulb is carried by the receptacle plug. 3. The UV liquid treatment system of claim 2 wherein the receptacle plug comprises a receptacle plug body, a plug head carried by the receptacle plug body and a light bulb receptacle carried by the receptacle plug body, and wherein the UV light bulb is carried by the light bulb receptacle. 4. The UV liquid treatment system of claim 3 wherein the receptacle plug comprises a tapered body surface tapering from the plug head to the light bulb receptacle. 5. The UV liquid treatment system of claim 4 wherein the assembly cavity comprises a straight cavity portion and a tapered cavity portion communicating with the straight cavity portion, and wherein the light bulb receptacle of the receptacle plug is seated in the straight body portion and the receptacle plug body of the receptacle plug is seated in the tapered cavity portion of the assembly cavity. 6. The UV liquid treatment system of claim 5 wherein the receptacle plug body of the receptacle plug comprises an elastomeric material. 7. The UV liquid treatment system of claim 1 wherein the at least one liquid inlet passage comprises a primary inlet passage segment and a secondary inlet passage segment perpendicular to and communicating with the primary inlet passage segment and the container interior of the unit container. 8. The UV liquid treatment system of claim 1 wherein the at least one liquid outlet passage comprises a primary outlet passage segment and a secondary outlet passage segment communicating with the primary outlet passage segment and the container interior of the unit container. 9. A UV liquid treatment system, comprising: at least one UV treatment unit including: a unit container having a container sidewall, a container bottom extending from the container sidewall and a container interior formed by and between the container sidewall and the container bottom;a liquid distribution head carried by the unit container;at least one liquid inlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container;at least one liquid outlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container, the at least one liquid inlet passage and the at least one liquid outlet passage disposed generally in 180-degree relationship to each other on opposite sides of the liquid distribution head;a transparent light bulb shield carried by the liquid distribution head and having a shield interior;a descending liquid flow passage formed by and between the light bulb shield and the container sidewall of the unit container, the descending liquid flow passage disposed in fluid communication with the at least one liquid inlet passage;a transition space formed by and between the light bulb shield and the container bottom of the unit container, the transition space disposed in fluid communication with the descending liquid flow passage;an ascending liquid flow passage formed by and between the light bulb shield and the container sidewall of the unit container, the ascending liquid flow passage disposed in fluid communication with the transition space and the at least one liquid outlet passage;an assembly cavity in the liquid distribution head and communicating with the shield interior of the light bulb shield;a UV light assembly having a UV light bulb removably seated in the assembly cavity, the UV light bulb disposed in the shield interior of the light bulb shield; anda power source electrically connected to the UV light bulb of the UV light assembly; anda shutoff valve disposed in fluid communication with the at least one liquid inlet passage in the liquid distribution head. 10. The UV liquid treatment system of claim 9 wherein the UV light assembly comprises a receptacle plug seated in the assembly cavity and wherein the UV light bulb is carried by the receptacle plug. 11. The UV liquid treatment system of claim 10 wherein the receptacle plug comprises a receptacle plug body, a plug head carried by the receptacle plug body and a light bulb receptacle carried by the receptacle plug body, and wherein the UV light bulb is carried by the light bulb receptacle. 12. The UV liquid treatment system of claim 11 wherein the receptacle plug comprises a tapered body surface tapering from the plug head to the light bulb receptacle. 13. The UV liquid treatment system of claim 12 wherein the assembly cavity comprises, a straight cavity portion and a tapered cavity portion communicating with the straight cavity portion, and wherein the light bulb receptacle of the receptacle plug is seated in the straight body portion and the receptacle plug body of the receptacle plug is seated in the tapered cavity portion of the assembly cavity. 14. The UV liquid treatment system of claim 13 wherein the receptacle plug body of the receptacle plug comprises an elastomeric material. 15. The UV liquid treatment system of claim 9 wherein the at least one liquid inlet passage comprises a primary inlet passage segment and a secondary inlet passage segment perpendicular to and communicating with the primary inlet passage segment and the container interior of the unit container. 16. The UV liquid treatment system of claim 9 wherein the at least one liquid outlet passage comprises a primary outlet passage segment and a secondary outlet passage segment communicating with the primary outlet passage segment and the container interior of the unit container. 17. A UV liquid treatment system, comprising: at least one UV treatment unit including: a unit container having a container interior;a liquid distribution head carried by the unit container;an assembly cavity extending through the liquid distribution head, the assembly cavity having a straight cavity portion and a tapered cavity portion communicating with the straight cavity portion;at least one liquid inlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container;at least one liquid outlet passage in the liquid distribution head and disposed in fluid communication with the unit container interior of the unit container;a transparent light bulb shield carried by the liquid distribution head and having a shield interior;an assembly cavity in the liquid distribution head and communicating with the shield interior of the light bulb shield;a UV light assembly having a tapered receptacle plug body seated in the tapered cavity portion of the assembly cavity, a plug head carried by the receptacle plug body and engaging the liquid distribution head, a light bulb receptacle carried by the receptacle plug body and seated in the straight cavity portion of the assembly cavity and a UV light bulb carried by the light bulb receptacle, the UV light bulb disposed in the shield interior of the light bulb shield; anda power source electrically connected to the UV light bulb of the UV light assembly;a shutoff valve disposed in fluid communication with the at least one liquid inlet passage in the liquid distribution head;a controller interfacing with the power source, the UV light bulb of the UV light assembly and the shutoff valve; andat least one of an indicator light and an alarm buzzer interfacing with the power source and the controller, the controller adapted to close the shutoff valve and activate the at least one of an indicator light and an alarm buzzer responsive to non-functioning of the UV light bulb of the UV light assembly. 18. The UV liquid treatment system of claim 17 wherein the receptacle plug body of the receptacle plug comprises an elastomeric material. 19. The UV liquid treatment system of claim 17 wherein the at least one liquid inlet passage comprises a primary inlet passage segment and a secondary inlet passage segment perpendicular to and communicating with the primary inlet passage segment and the container interior of the unit container. 20. The UV liquid treatment system of claim 17 wherein the at least one liquid outlet passage comprises a primary outlet passage segment and a secondary outlet passage segment communicating with the primary outlet passage segment and the container interior of the unit container.