Trichlor pucks can be useful if your CYA is low. But, as you know, over time they add CYA and you have to stop using them. A lot of people use them when they go on vacation. You have no idea how many people come to the forum because of the very problem you have had --- getting algae despite having what they think is an adequate chlorine level. Not too many people, pool stores included, understand the connection between CYA and chlorine.
What kind of test kit are you using? A CYA reading of 100 doesn't necessarily mean 100. It can actually mean 100 or any number greater than that. Dilute a sample -- half pool water, half distilled water -- and then run the CYA test with that mixture. Multiply the results by 2 and then report that CYA reading here.
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