Here's a link to the bleach calculator that we like to use http://www.poolforum.com/pf2/showthr...18-bleach-calc

You need to add your bleach as often as necessary to keep your chlorine in the appropriate range as determined by your CYA level (see the "best guess chart" linked in my sig above). We recommend that you test your water every day and add whatever amount of bleach needed to come back up to your target level. I would recommend that you do this in the evening to reduce the amount of chlorine that you lose to the sun.