Patent ID: 7094353

Claim:
A method of treating a volume of water to maintain a predetermined amount of a water treatment chemical in the volume of water over a time period comprising, determining an amount of a water treatment chemical to be preserved in a volume of water to be treated, calculating a maintenance dose of the chemical to be added to the volume of water to maintain about the amount of the chemical in the water over the time period, providing a source of the chemical, and supplying the maintenance dose of the water treatment chemical to the volume of water, wherein the maintenance dose is calculated according to equation (1): MD =( PV )( DC )(1) where MD=Maintenance dose of water treatment chemical (oz.); PV=Volume of water to be treated (gallons); and DC=Consumption of water treatment chemical over the time period (oz. per 1000 gallons); and wherein the supplying of the maintenance dose is performed by a pump having a pump tube displacement and which is caused to operate for a run time determined according to equation (2) RT =(( K )( MD )/( PRPM×PTD ))2) where: RT=Run time of pump (sec) PRPM=Pump speed (RPM) PTD=Pump tube displacement (ml/pump revolution K=1776 ((sec-ml)/(min-oz)), and MD is defined as in equation (1).