Slam?

I have been using the site for a while and on my second pool. Just now having my first problem. Water clarity is fine. Numbers seem ok. However, my chlorine keeps dropping and dropping. I'm now at the point where my SWG is at 40% and still supplementing with liquid as my FC will drop to 2 in about three days. So visible signs of algae.

FC 5
PH 7.8
TA 100
CH 250
CYA 60
Salt 3600

I know my CYA should be a little higher but I've been thinking I may need to slam. Suggestions? I plan on...

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