It is not normal for anything to be blowing through the filter--my guess is that either the filter that you're using just isn't sealing correctly, or that maybe you have too big of a pump. What size pump are you using?
In order to get the algae out of the pool, you need to shock it with chlorine, but we need to know your CYA level in order to know how high to take your chlorine. If you could run a set of tests with your drop kit and post the results here, we can better advise you on where to go from here.
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