This 5,600-gallon pond has 9" thick concrete block walls, rendered, and then fibre-glassed. |
 |
The pre-fabricated fibreglass filter module consists of four chambers and a discharge box. This was a standard module as supplied at that time by Infiltration. Each chamber is octagonal in shape, 42” wide, and 24”deep to the media support tray (diagram below). The void space below this is 12”deep and is benched. The base of each chamber has 4 X 100 mm cylindrical air stones installed to ensure no settlement.
|
Each chamber has a two-inch drain at the base, which is connected to a separate valve in the discharge box.
There is an overflow in each chamber (except the K1 chambers) to remove excess water, floating debris, and the protein layer from the surface of the water. The discharge box itself has a four-inch waste pipe to take the waste water to the house main drains. |
 |
The pond has three 4-inch bottom drains. Two of which connected directly to waste via the discharge box, and these are connected to stand pipes fitted with "O" rings. The drains are flushed to waste several times a day.
The remaining third drain directly feeds a “Maurice Cox” Tower, filled with original Bacteria House media. This “Shower Tower” is fed by an Oase Aquamax ECO 16000 pump. The water is returned via the lower pool of the water fall.
|
A GE Merlin Reverse Osmosis (RO) system is also employed for top up water. RO water and purified tap water are mixed to produce soft, low TDS water.
Electronic float switches are fitted to Bay 4, which will automatically switch off the pumps in the event of a major leak, or should the pumps be starved of water for whatever reason. |
 |
The gravity feed from the pond to the first chamber is via a six-inch pipe, and takes mid-water from the pond side. Aeration is supplied to the second, third, and final filter chambers. The air is supplied to the filter system via three Airtech 80 air pumps and one Airtech 40. The first chamber has static K1, the second chamber has 200 litres of Kaldnes K1 and 100 litres Biochips, the third has 150 litres of Kaldnes K1 and 100 litres Biochips, and the forth chamber has a 16” deep Japanese Matting cartridge which is heavily aerated from underneath. Each of the Kaldnes chambers has 80 litres air per minute supplied.
Click here to see the Kaldnes conversion. |
 |
The water is pumped from the fourth bay by a 3/4 HP ITT Marlow pump through a 30" Lacron Sand Pressure Filter, filled with AFM glass media. The sand filter is back-flushed every day of the year.
The clean water then passes through an indirect gas heating system (Potterton, 60,000 Btu, Kingfisher domestic boiler, fitted with a 230,000 Btu stainless steel heat exchanger) returning to the pond through a 55W UV and then a waterfall and venturi.
|
| A surface Skimmer is also fitted, which is operated with a 1/3 HP ITT Marlow pump, and the water is circulated via a deep water return directly to the pond. |
| |
|
Click
on any image for a larger image |
|
|
