Slime build up in water fountains and bowls

[MrCaveman]

For most of my snake's enclosures I like to use table top fountains as their drinking source and humidity control; Hwever the only problem is that slime builds up very quickly. Could someone tell me what this slime/bacteria is and how; if there's a way to get rid of it other than constant cleaning? Its a pain the a** to clean these fountains every week and I was wondering if this slime/bacteria is even harmful to my snakes. I was thinking about putting some pond sludge removal product from homedepot that advertises getting rid of sludge and is non-toxic to fish and wildlife that drink from it. It supposedly adds beneficial bacteria to eat up the slime.