Utilizing a sump bottom drain is not such a mystery anymore… There are two main filtration options with your pond, pump fed and gravity fed systems.
A gravity fed system utilizing a sump bottom drain is preferred with a larger pond and needs to be built into your pond from the beginning. This method is preferred to reduce overall maintenance.
The idea of the bottom drain is that it uses gravity feed to draw water and mulm (the proper term for pond dust) to the filter system. Bottom drains do not pull solids off the bottom. They are specifically designed to remove organics by creating a unique dynamic in the pond’s circulation system.
Ponds rely on beneficial bacteria colonies to breakdown fish waste, and other organic material such as leaves, pine needles, pollen, dust and other forms of water logged debris that typically settles to the bottom of a pond.
Determining the proper size sump bottom drain that is best for your water garden for optimal flow rates and proper use of aeration complements a pond drains ability to function properly.
Most ponds require 3″ or 4″ drains. 3″ drains should optimally have a max flow rate of approximately 1800 gallons per hour and will service an 8′ diameter pond bottom nicely. 4″ Gravity Flow Bottom Drains should have a max flow rate of approximately 3600 gallons per hour and will service a 10′ diameter water garden bottom nicely.
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