I am about to go on an extended 3 weeks trip during which I will have somebody else keeping an eye on the (40,000 ltr) pool. I believe I have got my CYA levels down to around 25 (will double check tomorrow). I am hoping this will allow me to add chlorine/stabilizer pucks to the skimmer to provide a continuing source of chlorine in my absence & minimize the frequency of topping up with liquid chlorine. Is there some equation that roughly describes the amount of chlorine & stabilizer released from pucks over time?