I want to know what tools I need to remove this drain cover. The insides are starting to get clogged and I'm afraid of overflow.
Can I remove without sawing it off?
Either stick a screwdriver/crowbar in the gap round the edge and lever it up, or just stick a crowbar into the grillwork and lever. Be careful with the second option though - if it's fixed in hard, you might snap the grill.
Check the small holes at the top and bottom of the picture - they might contain some sort of bolt which needs to be unscrewed with (eg) an Allan Key.