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Last koi pond I built....
Gunnite and plaster.
22,000 gallons including filtration system.
2 bottom drains, feeding to solids seperator then pump, then upflow biofilters.
4 skimmers, feeding to pump then pressurized cannister filter then back to waterfall and four jets.
4 pumps. One pump for the skimmer loop. Two pumps for the bottom drain loop and one pump to pump wastes from the sump and filters to the sewer. The sewer pump and the two bottom drain pumps are interchageable if one fails. The loop will work, at half speed if one pump fails.
Almost half the pond volume circulates through the skimmer loop every hour. About half the pond volume circulates through the bottom drain loop every hour. Entire pond passes through filters one time every hour and ten minutes.
Either loop will carry the entire load if the other loop fails (multiple redundancy). Cross valving will allow for the system to process either source water (bottom drains or skimmers) at either system loop.
Source water (city water) is processed to remove chlorine, and heavy metals, as well as lower the hardness and alkalinity. Fully treated source water is blended with partially treated source water to get the right hrdness and alkalinity.
The pond had to be built as a "swimming pool" due to city codes. So, it does have a shallow end (just over 1 meter) and a deep end (just under 3 meters).
The pond has a fence around it, 1.5 meters tall and right against the water's edge. This to keep jumpers in the pond and kids out of it. The fence is quickly and easily removed for viewing the pond without obstruction.
This is a koi pond. For and about the koi. There are no plants in the pond, no rocks on the bottom, no cutesy frog spitters, no bog, nothing to interfere with proper koi keeping.
Brett
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Brett
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