Still have lots of work to do [ update on pond rebuild

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Cool. Where's your intake? Looks like your water is returning into a preformed pond and then out to a stream?
 
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it would be easier to draw it out than enplane it.

There are 2 water discharges into the system
1 is the waterfall
2nd is just to the left of where the waterfall drops into the pond.
both can be independently controlled in the pump pit.

water has 2 ways of exiting the main pond.
1. under the waterfall are 3 bottom drains.
2nd is the spillway leading to the preformed pond aka bio filter.

on the bottom of the preformed pond is a grid of pvc pipes covered with rock, stone, and pebbles, this network of pipes also leads to the pump and can be independently controlled.

Hope this helps

At a later point in time I will do a write up with drawings explaning what, where and why.
 
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Got it. So a downflow bog/under gravel filter. How is it with clogging? Do you have to clear the gravel often?
 
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it's a new setup.
if it were to be an up flow bio filter I'd need to run a second pump, something I'm doing my best to avoid. The top of the waterfall is a upflow bio filter but it's not large enough to handle the load on it's own
Everything is gravity feed/ cleaned before it hits the return pump.
 

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