Your situation is tricky to know if it's algae or metal. "Hard" water is not a factor right now so much as if they have any metals in it. Your water is a clear green which might indicate metal, but you also confirm debris in the bottom of the pool which, if it has been there a while, would certainly contribute to organic build-up/algae.
To SLAM means you would need to increase your FC to "20" and maintain it until the algae is killed and you pass all 3 SLAM criteria. But if it's metal, the elevated FC will only make the green more prominent and could cause the metal to try and precipitate-out onto the pool surfaces. You also had good test results above which make me hesitate to confirm one way or the other. So a pic may help.
PH wasn't listed above, so if you do move-forward to begin the SLAM and go the algae route, make sure to adjust pH to about 7.2 before beginning. If you're curious about metals, you could take a water sample from your hose (not the pool) to the pool store and have them do a free test. Just take the report and leave and let us know if they show any iron/copper. You haven't added any algaecides in the past have you?
