Note: After testing, we have found that this water recycling setup is NOT effective in removing orginc waste buildup. Therefore, not recommend to be used for growing microgreens.
Effort has been made to improve the DripGrow microgreens system created last time and reported here. Watch the following video first:
One consideration is to recycle the water to be reused. Two Rona buckets were used to ensure the double filtration. First a hole was drilled on the side close to the bottom for each bucket so that a shutoff valve could be installed like this:
Add enough water to each bucket to make sure there is no leakage whatsoever:
Then each bucket was filled with filtration media in this sequence: pebble stones/gravels, perlite, crushed coral, and sand.
Another consideration is feeding water from the bottom for the tray containing seeds already sprouted and having leaves — trays on other levels contain seeds that do not have leaves yet:
Here is a closer look at the top tray:
Note that the tiny whitish things around the roots are root hairs, not mold. Root hairs are useful in helping microgreens to absorb moisture even in the air.