17,000 Gallon Pond


I was contacted to dismantle and remove the koi from an existing pond in preperation for demolition of the existing property to make way for a new building to be erected. During the building process a new pond was to be built to house the original koi. The original pond was 4000 gallons and the new pond was going to be in the region of 12,000 gallons. I was then asked to carry out the pipework, equipment installation and the filter build which was designed by Peter Waddington.


The hole was dug and the first concrete base was cast. Three bottom drains, 4" pipework and the 1" air lines were installed and pipework was run to the area designated for the filters. The walls were then partially built to mid water level and the returns for the filters and skimmers were set. The pond area was then backfilled so work could be commenced on the walls.


The 2 skimmers were built into the wall and all 2" pipework was installed to the area for the pumps. A shelf was also built for the large rocks to be placed on.


The 3 ERIC (Endless River In Concrete) filters were built onto a concrete base which had already been cast. The size of the filters is a standard 50cm wide to accept the rubber membrane air diffusers and matting cartridges.


This is the dry area at the end of the filters to house the pumps and uv's.


The pond was then fibreglassed by Shaun Hunter and the rockwork was set in position. Final landscaping was well underway and only planting and a tea house was all that was needed to be completed.


During the construction of the tea house all the filtration equipment was installed. This shows the 2 pumps which are fed from the skimmers and returned through uv's back to either the pond or the waterfall.


This shows the double valve setup that can either send the water direct to the pond or via the waterfall. The small orange valves are connected to a single 120 lpm airpump which then feed the rubber membrane air diffusers on the bottom drains.


These air and water pumps are connected to the filtration system. Each filter has a 120 lpm air pump feeding 4 rubber membrane air diffusers in between each Japanese matting cartridge. The water pump on each filter is a 12,000 lph returning water direct to the pond.


All the equipment is housed within the tea house floor and has electrical switches at ground level to aid in the filter cleaning. The filters are cleaned on a regular basis but only take 90 seconds to discharge and be cleaned.


The finished pond is ready to be filled and this is done with a water meter to get the exact gallons for medication purposes. The tea house is also nearing the final stage of build with only windows and seating to be installed.