It won't turn green, if you keep the chlorine up. Check your CYA or stabilizer level (get it tested if you need to) and then adjust your chlorine by following the Best Guess Chart, linked in my signature.
You can also use the link in my signature for Google Custom Search of PoolSolutions and the PoolForum. If you want to use the vBulletin native search, you'll need to upgrade to Registered+ status. This post
http://www.poolforum.com/pf2/showthread.php?14120
explains how.
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