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Message: [QUOTE="Meyer Jordan, post: 268021, member: 7131"] The is currently nothing on the market that is safe for use in a pond. Even if there was you would not want to use it for it would destroy the biofilm that is present on every other submerged surface in the pond. [U][I][B]That[/B][/I][/U] you do not want to do. As far as I know there is nothing on the market anyway that effectively (and permanently) removes biofilm other than sand-blasting. I suspect, Ratsima, that the source of your problem is your guppies feeding on microorganisms that inhabit the rhizosphere of the Pistia. In the process they are breaking of tiny pieces of root which are eventually being drawn into the pump. These small organic particles are gradually being trapped by the biofilm in the piping, much like plaque accumulates in a human's arteries, eventually causing blockage.To solve this problem, this organic debris must be trapped before it enters the pump. This is why I inquired about the pre-filter. At present, you actually have no mechanical filtering, a must for any pond with fish. [/QUOTE]