This may sound like a dumb question, but I have never used any trichlor since I've had my pool, so please bear with me. I've got a couple of spots on the floor of the pool, I don't think it's black algae, but I want to confirm. I've read on here about rubbing the spots with a trichlor tab to see if it goes away. Is it safe to hold trichlor in your bare hands when in the water, or should I wear gloves? I've got to run to Home Depot for some lumber, and they sell single trichlor tabs, so no need to buy a bunch of them.