The overflow problem was due to the substrate.
Coconut with foam is substrate with very big moisture capacity , and AutoPot manufacturer recommends mix the main substrate with another, 50/50.
Coconut / Perlite would be perfect.
In addition to this manufacturer advises to add 2.5-5 cm (not more!) of expanded clay or perlite to the bottom that the main substrate was not constantly immersed in water.
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