The Native has created lined ponds in the ground to hold a large volume of water for keeping his fish. There are three in total, two hold 400 gallons each and the third is around 350 gallons. Originally he had created a ledge and one pond was higher, overflowing to the next. He realised that he could almost double the size by removing the steps in the pond and they could overflow between them if the ponds were at the same height.
IBC s created ideal growbeds when they were cut in half, each having a depth of around 500mm. He started off with gravel but in time made some renovations, which included changing over to ¾” black lava rock or scoria. The Native says that it is has more benefits than the gravel as it is cheaper, lightweight – therefore easier to shovel, it hasn’t affected the pH and it has a high porosity making an idea surface for beneficial bacteria.
An Affnan bell siphon controls the flood and drain in each of the growbeds, the bell is 4” and the standpipe is 2.5” which reduces to 1.25” as it exits the grow beds. All the growbeds drain in to 4” drainage pipe which then returns water to the pond. The standpipe is housed in a media guard made of pvc pipe which is 6” in diameter allowing access in the event that the siphon requires any attention. The other end of the bed also has a 6” pipe that is a worm feeding station.
The pump used was a 800 GPH (3000lph) probably requiring an upgrade at some point said the Native. A (SLO) solids lifting overflow was installed using 4” pipe to help with the build up of solids in the second fish pond. Water is pumped to fill the growbeds which takes around 22 minutes and then drains in around 3 minutes. The system has produced great harvests of vegetables such as carrots, celery, onions and trout. Just take a look at the pictures of the healthy plant growth.