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Update: Don't make this version! Too difficult. 
I have a better, easier version.
I will publish soon. 

I saw many pet dropper idea on internet, but all wasn't perfect. From most come the water too fast.
I have developed this system.
Enjoy.
Instead of black foil use aluminium foil.
Here is one.

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More by LongJohnHolmes:Stretch Film Greenhouse (Or Any Other House) Modular Vertical Garden. floating chemical dispenser for pool 
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