Originally Posted by
mellow
^
I agree that a separate up stand pipe to discharge accumelated waste from the bottom of the tank is a welcome idea and should be used. The pipe does not have to be external. It can be located within the tank. A lot of waste does however overflow with the single pipe.
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if the upstand pipe is located outside of the tank, with it's inlet at the lowest level of a sloped tank floor, the waste accumulating at the bottom of the slope virtually gets sucked out when the pipe overflows, which is all the time that the water flows into the tank from the filter, plus the outlet pipe can be swivelled to adjust water level, and emptying of the tank to harvest or for maintenance is easy.
dalton was having to use a submersible pump to empty his tanks every time someone came to buy fish, (electricity, time, labour.............)