After doing research on growing plants without soil, I came up making my own version.
...and to save electricity, I was obliged to design and build a customized pump timer, which I successfully did after nights of trial and error. The circuit is continuously powered by a 12 DC voltage (negligible power consumption which will turn-on the 220 volt power of the submersible 18-watt pump for only 2 minutes. Then after 2 minutes, it will automatically shut-off the 220 volt line and sleeps again for 15 minutes.
In my first attempt, all 6 grown tilapia I put died a day after. I don't have pH tester so I don't know if the water was conducive enough for the fishes. The water was beer-like color due to the newly installed coconut husks as my medium, and there were no algae yet that had grown. I did my research again about raising tilapia...now I know.
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