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Message: [QUOTE="Ratsima, post: 495036, member: 7468"] I've never understood where it comes from. The pond water is always crystal clear and there is rarely any algae buildup anywhere in the pond. My guess is that the sludge that builds up in the foam pre-filter is formed there, just like the sludge in the hose doesn't come from anywhere, it forms inside the hose. Clearly, something is feeding the bacteria and other organisms that create the biofilm, but I don't know what it is. There are no large fish in the pond. I have eliminated the Pistia (as advised in this thread). You would think that if there were excess nitrogen in the pond it would show up as cloudy water or algae build up. But it's not like that. After all these years, it's still a mystery. [/QUOTE]