The type of stone used in and around the pond is important. Select from river stone, boulders, slate, sandstone, flagstone, brick, lava rock or basalt. These types of stone do not leach harmful substances into the water. Only use limestone that has been weathered outdoors for at least six months. Lime is very alkaline, and will drastically affect the pH of the water, harming fish and plants. Be careful too when mortaring pavers and rocks around the pond. Cement dust contains high levels of lime.
 
You can choose to use pressure treated wood around the edges of the pond - this will last much longer than untreated wood. Do not use railway sleepers - they often contain high levels of oil, tar, and harmful herbicides.
 

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Web Administrator - Isa Webb.
Last Updated: Monday February 22, 2010