The weight of this forced me to add extra legs along the bottom to spread the weight. I built the frame when I planned just two buckets. This allows the water that leaves the buckets to return to the system using gravity. So, you have your Dutch bucket/s and you need a stand for them to hold them at a height above the sump tank. These holes are there to allow the water to overflow back into the system without allowing your stones to leave the bucket. Make sure to measure so that the holes end before the pipe goes through the uniseal as this will allow water to leak out of the system. Insert your uniseal and then take your pipe and drill a series of 8-10mm holes in the section that will be inside the bottom of the bucket. Now, you have a hole in the side of the bucket, the bottom of said hole is approximately 5cm from the bottom. This will prevent the teeth from gripping and it will make a smoother hole which allows the uniseal to make a better seal. Now, when the hole saw teeth are ready to cut, switch the drill into reverse. To make the hole, start drilling with the drill spinning forward until the drill bit section of the hole saw is through the plastic. Once cut and smoothed, I cut the hole about 5cm from the bottom. So my final bucket leaves a lot of space for tree growth. It also means that the water that leaves the bucket has less nutrients in it and is cleaner when it flows back into the sump tank. It also allows the plant to access any water or food it wants. This constant flow means that the water remains oxygenated and prevents root rot. once this area is full, the water slowly overflows down the drain pipe. As water flows in through the opening at the top of the bucket, it drops through the plant roots then fills the 5cm section at the bottom. A Dutch bucket is a constant flow system that stores just 5cm of water at the bottom of the bucket at any time.
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