Does anyone know if somebody in the world makes a PVC or ABS pipe that will fit the interior diameter of a 3" bottom drain? This year I have tons of algae on the bottom of my pond even though the water is crystal clear. If I use my pond vac the basket gets clogged up verrry quickly. I was thinking of using only my pond vac hose, plug it into my 3" bottom drain, and then start to partially empty the pond by gravity out into the back yard. For the winter season, I drain my pond down to 2 feet from my 4 foot deep pond so that my skimmer does not freeze.
I have checked out a 3" street 90º but it does not fit "into" the pipe.