algea and chlorox
I tried posting this a few minutes ago but it went away. I apologize if it shows up twice now:
There was a thread earlier about algea on pots. This may not apply to other situations but I found scum on the water in the trays on which I keep my av pots (ceramic, non-porous). I mixed 1/4 tsp chlorox with 2qts water and added it to the trays. I don't know if the fumes may have affected the plants but the scum has disappeared.