A gap of usually around 2 to 5cm is set between the top of the sump and the dome, and should stop smaller pond fish from entering the filter system.
As the pipe-work used in the construction of a gravity fed filter runs under the pond and is usually set in concrete, bottom drains should be considered at the outset of pond planning , and installed as the pond is constructed. Bottom drain set ups are a much more efficient than having a pump situated in the pond , pushing water to a filter. Bottom drains can handle larger solids than most types of pond pumps, and are far less likely to block or become hampered by debris. A pond can be built with multiple bottom drains along the floor, leaving no areas in the pond for sludge to accumulate.
It is recommended that the pipe-work between the bottom drain and the filter should be Solvent Weld Pressure pipe. Thread Tools Show Printable Version. This user has no status. Feeling: Please select a category to choose from: - Cancel. Join Date Mar Location vancouver Posts How many bottom drains?
What is the minimum number of 4" aerated bottom drains that would be needed in a 22'x16' pond. The bottom will be sloped from 3' at the edges to 5' at the drain s. There will be 4 TPR one on each side to move water to the drains. The pond will also have a waterfall at one end and a skimmer at the other. I would say two with a filter system on each if poss.
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