US 11,788,312 B2
Pool and spa water quality control system and method
Tadmor Shalon, Palo Alto, CA (US); and Richard A. Falk, San Rafael, CA (US)
Assigned to WaterGuru Inc., Palo Alto, CA (US)
Filed by WATERGURU INC., Palo Alto, CA (US)
Filed on Sep. 21, 2021, as Appl. No. 17/481,089.
Application 17/481,089 is a continuation of application No. 16/796,406, filed on Feb. 20, 2020, granted, now 11,162,272.
Application 16/796,406 is a continuation of application No. 15/569,852, granted, now 10,604,954, issued on Mar. 31, 2020, previously published as PCT/US2016/029293, filed on Apr. 26, 2016.
Claims priority of provisional application 62/293,167, filed on Feb. 9, 2016.
Claims priority of provisional application 62/153,373, filed on Apr. 27, 2015.
Prior Publication US 2022/0003014 A1, Jan. 6, 2022
Int. Cl. E04H 4/12 (2006.01); G01N 33/18 (2006.01); C02F 1/68 (2023.01); C02F 1/76 (2023.01); C02F 1/00 (2023.01); C02F 1/78 (2023.01); C02F 1/467 (2023.01); C02F 1/32 (2023.01); C02F 103/42 (2006.01)
CPC E04H 4/1281 (2013.01) [C02F 1/008 (2013.01); C02F 1/685 (2013.01); C02F 1/76 (2013.01); G01N 33/18 (2013.01); C02F 1/32 (2013.01); C02F 1/4674 (2013.01); C02F 1/78 (2013.01); C02F 2103/42 (2013.01); C02F 2201/006 (2013.01); C02F 2209/005 (2013.01); C02F 2209/008 (2013.01); C02F 2209/02 (2013.01); C02F 2209/06 (2013.01); C02F 2209/11 (2013.01); C02F 2209/29 (2013.01); C02F 2303/04 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of controlling turbidity of water in a water installation, the method comprising:
sensing scattered sunlight reflected from a first area of a target in the water and from a second area of the target in the water;
generating a signal from the scattered sunlight reflected from the target by comparing the scattered sunlight reflected from the first area to scattered sunlight reflected from the second area; and
using the signal to control operation of a filter pump pumping water through a filter of the water installation.