Works but cloudy

After reading it worked well in the sun and not wanting to plug the pool on the 220, I ordered this solar air pump.
It consumes so little that even with good light, so no direct sun, bubbles are produced.
When the sun is above, the bubbling and a spa for fish!
Exactly what I was looking to ventilate a little pond water.
The bubbler is approximately 30 cm underwater. The supplied hose is plenty long (in my case).
Minor complaint: the power cable is too short; if we want to easily put the solar collector to a open area should be able to have a waterproof extension cord (same connector as the equipment provided). Short of that, the system often works slowly, but works.