Patent ID: 9539529
Date: 2017-01-10
CPC Classifications: B01D

Claim:
1. A method for reusing backwash water in a circulating pool filtration system, comprising: a. providing a pump having a pump intake line and a pump discharge line; b. providing a sand filter having a discharge line and a backwash line; c. providing a sediment retention tank; d. starting a backwash cycle in which flow in said sand filter is reversed and water forced through said sand filter by said pump flows out through said backwash line; e. routing said water flowing out through said backwash line to said sediment retention tank; f. stopping said backwash cycle after said retention tank is substantially full; g. starting a filtration cycle wherein water is forced through said sand filter by said pump and flows out through said discharge line; h. allowing said water in said sediment retention tank to stand for a time sufficient to allow sediment within said water to settle to the bottom of said sediment retention tank; i. providing a tank line in said sediment retention tank, said tank line having a tank line intake positioned to avoid said sediment in said bottom of said sediment retention tank and said tank line intake having an opening which is substantially upward facing; j. connecting said tank line to said pump intake line; and k. drawing said water within said sediment retention tank into said pump and back into said circulating pool filtration system.