I played around with the valves, but nothing worked. Since my order was wrong, the website sent me another skimmer, (the same). I installed it today to see if is was a problem from the pump, but it didn't work either.
Both skimmers are pluged in, both of this have the following problems:
- no microbubbles are produced inside or outside the skimmer
- no foam is produced inside the collection cup
- Skimmer water level pulses.
Both of them are brand new skimmers, the pumps are pluged , nothing is clogging the venturi air-inlet. There is enough space between output tubing and the sponge.
Thank you all