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Whoa! *Why take out the sludge? *It's not a swimming pool! *But the
sludge is home to all sorts of pondlife. *Leave it alone unless you're
talking about genuine dredging of a very large pond to increase its
water depth from a natural inflow. *That's another whole issue.
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A pond is an evolving process not an entity. It goes through a natural succession of increasing sludge, plant colonisation in the now shallow water, marsh, and so on. If you want to keep a pond, you have to keep it in a stage of suspended animation, which means reducing the depth of sludge every few years. Same as the rest of gardening!
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