I've always just rubbed the top of the disk with either bare hand or gloved hand. I try to do it with air applied with the membrane ballooned up. Usually do it at the bottom of the pond while they are running but did it with them out of the water today. Rubbed all the scum and bryzoans off then just rinsed with water.
Pulled three stations today (each double Matala 9"), cleaned them and put them in the shed for the winter. Will put them back in the water next May or so. Plugged the hose end and attached a marker buoy to locate the hose to reattach next year.
