Apparatus and method of water treatment with preliminary screen

Details Apparatus and method of water treatment with preliminary screen Apparatus and method of water treatment with preliminary screen

2007-11-20

2007-11-20

Lithgow, Thomas M. (Department: 1724)

Liquid purification or separation

Particulate material type separator, e.g., ion exchange or...

Within flow line or flow line connected closed casing

C210S190000, C210S191000

Reexamination Certificate

active

11188562

ABSTRACT:
The present invention provides a water treatment system, such as a water softener, with a resin tank having a top distributor with a preliminary screen and second screen. The preliminary screen provides added protection by reducing the chance of larger particles from entering the various valves and screens. Prior to the regeneration cycle, an additional back wash and fast rinse cycle are added to rinse sediment to the drain and to clean the preliminary screen.

REFERENCES:
patent: 2973097 (1961-02-01), Snider
patent: 3809247 (1974-05-01), Brett
patent: 4136032 (1979-01-01), Bakken et al.
patent: 4228000 (1980-10-01), Hoeschler
patent: 5162080 (1992-11-01), Drager et al.
patent: 6696963 (2004-02-01), Zimmerman et al.

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