One other thing to note, my friend informed me that his pick up in his main fuel jug was supposed to have a screen on it, when he examined it he found that the screen had fallen out of the pick-up.

As BaldEagel posted there are a lot of people that fill through the UAT...(myself included) which puts any residue that was not filtered directly into the UAT.

Bottom line is there were multiple things leading up to this condition that could have possibly been avoided... the purpose of this post was to let readers know what the results were of having Algae in the UAT... and they were a time delayed reduction of power.

Fortunately the aircraft was an Elan which is more tolerant of low power situations.