My hydropool serenity 6000 elite plus(2 motors) always seems to foam as the aeration is added. Foam away works but only for that particular soak . next day ,same thing. My water test shows it is fine,the watwer is two weeksold(new tub). ithas ben getting used at least two hours a day since we got it. I do add chlorine not dichlor after every use. Once a week(twice now) I have added a pkg. of spa-lite water treatment. Any ideas? thanks,Bobhol