OK, to get the ball rolling.
I believe with this filter it is recommended that the pond is turned over every 2.5 hours. i.e that the whole volume of the pond passes through the filter (or one of the filters if more than one is used) in this time.
May I ask the basis for this recommendation, and why for example a shorter or longer turnover period is not preferable.
Gibbo
Believe nothing, no matter where you read it or who said it, not even if I have said it, unless it agrees with your own reason and your own common sense. Buddha