I rent a house and it has a concrete Koi fish pond and what I believe is called a gravity fed filter system. (Please bare with me, this is all new to me)
There is a vertical overflow pipe, which takes the water from the pond into the first sump (think that's the correct term). There are 4 of these ground level sumps next to one another and it appears the water moves from 1st one to the 2nd when it gets a certain height and flows over the connecting walls. Then there seems to be a higher wall that separates 2nd and 3rd sump, not sure how water moves there, might be a submerged pipe? Then water moves from 3rd to 4th sump over as wall again.
I can see there is what appears to be small bio balls floating in each sump, but there's hardly any there.
In the last sump there is pipe that come up and out and connects into a large concreate pot which has what appears to be a bag of coral and oyster shells inside.
There is a 2nd pipe in this sump which takes the water back into the pond and optionally up for a waterfall across the back wall.
There is also 3rd pipe, which is t-shaped and also takes the water back into the pond
I believe I need a pump on the pipe which connects to the coral filter to suck it through, but I'm not sure how it goes back into the pond, as this pot seems to missing an outlet pipe connecting back to the pond. Athough there is a pipe with a screw cap at the bottom front and a hole at the top front
I've attached photos. If any one can make sense of this set up, all help appreciated.
My main questions are:
A. Do I just need bio balls in each of the 4 sumps and how many? Do I need to fill each sump? That would seem to require 10000s of them!
B. The pond is approx. 2777 litres in volume, what size pump do I need to filter that amount each hour?
C. Once water is filtered though the coral, how is it pumped back into the pond?
D. I found a device at the bottom of one of the sumps connected to a thin pipe, any idea what this is?
Thanks
There is a vertical overflow pipe, which takes the water from the pond into the first sump (think that's the correct term). There are 4 of these ground level sumps next to one another and it appears the water moves from 1st one to the 2nd when it gets a certain height and flows over the connecting walls. Then there seems to be a higher wall that separates 2nd and 3rd sump, not sure how water moves there, might be a submerged pipe? Then water moves from 3rd to 4th sump over as wall again.
I can see there is what appears to be small bio balls floating in each sump, but there's hardly any there.
In the last sump there is pipe that come up and out and connects into a large concreate pot which has what appears to be a bag of coral and oyster shells inside.
There is a 2nd pipe in this sump which takes the water back into the pond and optionally up for a waterfall across the back wall.
There is also 3rd pipe, which is t-shaped and also takes the water back into the pond
I believe I need a pump on the pipe which connects to the coral filter to suck it through, but I'm not sure how it goes back into the pond, as this pot seems to missing an outlet pipe connecting back to the pond. Athough there is a pipe with a screw cap at the bottom front and a hole at the top front
I've attached photos. If any one can make sense of this set up, all help appreciated.
My main questions are:
A. Do I just need bio balls in each of the 4 sumps and how many? Do I need to fill each sump? That would seem to require 10000s of them!
B. The pond is approx. 2777 litres in volume, what size pump do I need to filter that amount each hour?
C. Once water is filtered though the coral, how is it pumped back into the pond?
D. I found a device at the bottom of one of the sumps connected to a thin pipe, any idea what this is?
Thanks
