Back again....
I'm a big fan of aquaponic filtration in ponds, and so would like to offer a free service for the forum here for a limited time. (While I retain interest)
If people give me their pond volume
Fish stock: volume and type
Water temp range (winter through summer)
And current planting ie: water lilies cover ?? percentage of pond for approx ?? months.
I will do the math and propose a growbed volume required for keeping your pond beautifully clean.