I wouldn't add any floc just yet. We typically only recommend that as a last resort. Give your filter time to do its job. Live algae clogs DE filters fast which is why you are having that issue. Usually best to put a DE filter on recirculate until the algae is dead. Then work to filter it out afterwards.
Instead of using trichlor to add CYA, you can use dichlor which is a faster dissolving granular chlorine that also has CYA in it. It will introduce the dichlor more quickly. But, you have to be careful when buying it as many places sell blended products that have stuff in them you don't want. If you have a Sam's Club near you, you can buy their PoolBrand dichlor which is fine. If not, Amazon sells Kem-Tek which is also ok. You can get the Kem-Tek through our Amazon store. If you use this link (http://pool9.net/amz/), any purchases made earn the forum a small commission which helps to keep us online.
Hope this helps. Let us know if you have any further questions and welcome to the Pool Forum!
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