Hi Jim and welcome to the forum! Do you have actual testing numbers taken with a drops-based testkit. If so, please post them. One of the numbers we will also need is a CYA reading. Also, tell us the ingredients of the shock you are using and tell us what type of algaecide you added. Then, somebody here can help you figure this out. One more question I just thought of --- what type of filter do you have and what size pump.
BTW -- If you don't have a good test kit, you should get one. We recommend the Taylor K-2006 or 2006C that can be ordered through the Amazon link in my signature. By doing it through this link, the Pool Forum makes a little money which helps keep this place online.

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